Assume that children's IQs (Age6-12) follow a normal distribution with mean 100 and standard deviation of 12. Find the probability that a randomly selected child has IQ above 115. O 0.8944 O 0.0500 O 0.2500 O 0.1056 O 1.25

The compound interest account earns Isabella more money over the 10-year period due to the effect of compounding.

Explain compound interest

Compound interest is interest that is calculated on both the principal amount and the accumulated interest of an investment. It is essentially "interest on interest" and can result in a larger return compared to simple interest over time. The amount of interest earned is added to the principal, and the next interest calculation is based on the new, larger amount. As a result, the investment grows faster and larger over time with compounding.

According to the given information

Here's the table comparing the earnings in a simple interest account versus a compound interest account for Isabella's situation:

Account Type----------|--Formula------------------|--Interest Earned--|--Total Value

Simple Interest--------|--P*r*a------------------------|--$1,750--------------|--$5,250

Compound Interest--|--P*(1+r)ᵃ---------------------|--$2,294.64--------|--$5,794.64

Here is the time span.

Simple Interest is:

P*r*t =3500*(5/100)*10=$1,750

Total value = $3,500+$1,750=$5,250

Compound Interest is:

P*(1+r)ᵃ= 3500*(1+(5/100))¹⁰=$2,294.64

Total  value= $3,500+$2,294.64=$5,794.64

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From the box plot, the percentage of the data values that are greater than 65 is 50%.

We know that in the box plot, the first quartile is nothing but 25% from smallest to largest of data values.

The second quartile is nothing but between 25.1% and 50% (i.e., till median)

The third quartile: 51% to 75% (above the median)

And the fourth quartile: 25% of largest numbers.

In box plot, 25% of the data points lie below the lower quartile, 50% lie below the median, and 75% lie below the upper quartile.

In the attached box plot, the median of the data = 65.

So, all the values that are greater than 65 lie in the third and fourth quartile.

This equals about 50% of the data values.

Therefore, the required percentage of the data values that are greater than 65 = 50%.

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This result holds for any two harmonic functions f and g, and any closed surface S.

The flux of the vector field F through any closed surface S is zero, we can apply the divergence theorem:

∫∫_S F · n dS = ∫∫∫_V ∇ · F dV

So, n is the outward unit normal vector to the surface S, and V is the volume enclosed by S.

Let's compute the divergence of F:

∇ · F = ∇ · (f ∇g) - ∇ · (g ∇f)

= ∇f · ∇g + f ∇²g - ∇g · ∇f - g ∇²f

= f ∇²g - g ∇²f

So, we used the identities ∇ · (fG) = f ∇ · G + ∇f · G and ∇ · (∇f) = ∇²f.

Since both f and g are harmonic functions, we have ∇²f = ∇²g = 0, so ∇ · F = 0. Therefore, the flux of F through any closed surface S is zero:

∫∫_S F · n dS = ∫∫∫_V ∇ · F dV = ∫∫∫_V 0 dV = 0

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ProjW(v1) = [(v1 · [-y+z, y, z]) / ([1, 1, -1] · [1, 1, -1])] [-y+z, y, z]

= [(1/3)(-y+z)] [-y+z, y, z]

= [-y^2/3+y*z/3, y

To find the orthogonal complement of W, we need to find all vectors in R^3 that are orthogonal (perpendicular) to every vector in W.

Let v = [x, y, z] be a vector in R^3. To be orthogonal to W, v must be orthogonal to every vector in W, so we need to find a condition that determines which vectors in R^3 satisfy this requirement.

A vector in W is of the form [x, y, z] = [-y+z, y, z], since x+y-z=0 implies x=-y+z. The dot product of v with [x, y, z] is:

v · [-y+z, y, z] = (-x(y-z) + y^2 + z^2)

For v to be orthogonal to every vector in W, this dot product must be zero for every choice of x, y, and z. In particular, it must be zero for x = y = z = 0. Therefore, we have:

v · [-y+z, y, z] = (-x(y-z) + y^2 + z^2) = 0

This simplifies to:

y^2 - x(y-z) - z^2 = 0

This is a quadratic equation in y, with coefficients that depend on x and z. For this equation to have a solution for every choice of x and z, the discriminant must be non-negative:

x^2 + 4z^2 ≥ 0

This condition is satisfied for all x and z, so the orthogonal complement of W is the set of all vectors v = [x, y, z] in R^3 that satisfy the equation:

y^2 - x(y-z) - z^2 = 0

To find a basis for W⊥, we can use the Gram-Schmidt process to orthogonalize the standard basis vectors e1 = [1, 0, 0], e2 = [0, 1, 0], and e3 = [0, 0, 1] with respect to W. Any resulting vectors that are linearly independent will form a basis for W⊥.

Starting with e1, we need to find the projection of e1 onto W, which is:

projW(e1) = [(e1 · [-y+z, y, z]) / ([1, 1, -1] · [1, 1, -1])] [-y+z, y, z]

= [(1(1)+0(-1)+0(1)) / (1+1+1)] [-y+z, y, z]

= (1/3)[-y+z, y, z]

= [-y/3+z/3, y/3, z/3]

Then, we subtract this projection from e1 to get a vector that is orthogonal to W:

v1 = e1 - projW(e1) = [1, 0, 0] - [-y/3+z/3, y/3, z/3] = [1+y/3-z/3, -y/3, -z/3]

Next, we apply the same process to e2 and e3, using the previous vectors as the new basis for the subspace:

projW(v1) = [(v1 · [-y+z, y, z]) / ([1, 1, -1] · [1, 1, -1])] [-y+z, y, z]

= [(1/3)(-y+z)] [-y+z, y, z]

= [-y^2/3+y*z/3, y

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Answer:

To find out how many 2/5 meter pieces Sven can cut off from a board that is 9/10 meters long, we need to divide the length of the board by the length of each piece.

We can convert the mixed number 2/5 to an improper fraction by multiplying the whole number 1 by the denominator 5 and adding the numerator 2, giving us 7/5.

Then, we can divide the length of the board, which is 9/10 meters, by the length of each piece, which is 7/5 meters:

(9/10) ÷ (7/5)

To divide by a fraction, we can multiply by its reciprocal:

(9/10) x (5/7)

Simplifying the fractions:

(9 x 5) / (10 x 7) = 45 / 70

We can simplify this fraction by dividing both the numerator and denominator by their greatest common factor, which is 5:

(45/5) / (70/5) = 9/14

Therefore, Sven can cut off 9 pieces that are 2/5 meters long from a board that is 9/10 meters long.

Step-by-step explanation:

the simple answer is that Sven can cut off 9 pieces that are 2/5 meters long from a board that is 9/10 meters long.

rate 5* for more po~

a. The estimated potential capability of the process is 0.60.

b. The estimated actual capability of the process is 0.45.

c. The fallout in the process could be reduced by approximately 50% if the process were corrected to operate at the nominal specification.

a. To estimate the potential capability, we use the formula Cp = (USL - LSL) / (6 * sigma), where USL and LSL are the upper and lower specification limits, respectively, and sigma is the estimated standard deviation of the process.

Here, the USL is 105 and the LSL is 85, and the estimated sigma can be calculated using the formula sigma = s^bar / d2, where d2 is a constant value based on the sample size and the sampling method. For n = 5 and simple random sampling, d2 = 2.326.

Plugging in the values, we get sigma = 1.05 / 2.326 = 0.451. Therefore, Cp = (105 - 85) / (6 * 0.451) = 0.60.

b. To estimate the actual capability, we use the formula Cpk = min[(USL - x^bar) / (3 * sigma), (x^bar - LSL) / (3 * sigma)], which takes into account both the centering and the spread of the process.

Here, the x^bar is the sample mean, which is 100, and the sigma is the same as calculated in part (a). Plugging in the values, we get Cpk = min[(105 - 100) / (3 * 0.451), (100 - 85) / (3 * 0.451)] = min[1.11, 0.99] = 0.45.

c. If the process were corrected to operate at the nominal specification of 95, the new Cp would be (105 - 95) / (6 * 0.451) = 0.44, which is slightly lower than the current potential capability of 0.60. However, the Cpk would increase to (95 - 100) / (3 * 0.451) = -0.33, indicating that the process would be shifted to the left of the target, but the spread would be reduced.

The reduction in the fallout can be estimated by calculating the proportion of the process output that falls outside the specification limits before and after the correction.

Using the standard normal distribution, we find that the proportion of the output that falls outside the specification limits is approximately 0.27 for the current process, but it would be reduced to 0.13 after the correction. Therefore, the fallout could be reduced by approximately 50%.

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The lower and upper estimates of the integral are 8π and [tex]8\pi e^8[/tex], respectively.

To produce upper and lower estimates of the integral I=∫∫[tex]De^{(x^2+y^2)}dA[/tex] where D is the circular disk: [tex]x^2+y^2\leq 8[/tex], we'll first find the maxima and minima of the function f(x, y) = e^(x^2+y^2) on the given domain.
Step 1: Find the partial derivatives of the function f(x, y):
∂f/∂x = [tex]2xe^{(x^2+y^2)}[/tex]
∂f/∂y =[tex]2ye^{(x^2+y^2)}[/tex]
Step 2: Find the critical points by setting the partial derivatives equal to 0:
[tex]2xe^{(x^2+y^2)}[/tex] = 0 => x = 0
[tex]2ye^{(x^2+y^2)}[/tex] = 0 => y = 0
Thus, the only critical point is (0,0).
Step 3: Determine the value of the function at the critical point and boundary:
At the centre (0,0): f(0,0) = [tex]e^{(0^2+0^2)}[/tex] = 1 (this is the minimum value).
On the boundary [tex]x^2+y^2[/tex]=8 (radius of the disk is √8), the function value is:
f(x, y) = [tex]e^{(8)}[/tex] (this is the maximum value).
Step 4: Calculate the area of the disk:
Area = [tex]\pi (radius)^2[/tex] = [tex]\pi (\sqrt{8})^2[/tex] = 8π
Step 5: Use the maxima and minima to find the upper and lower estimates of the integral:
Lower estimate = minima * area = 1 * 8π = 8π
Upper estimate = maxima * area = [tex]e^8[/tex] * 8π =[tex]8\pi e^8[/tex]

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The measures of length QP and angle QRP are QP = 42 and QRP = 51 degrees

A rhombus is a quadrilateral with all four sides of equal length. Therefore, the sides of a rhombus are congruent (i.e., they have the same length). In addition, the opposite sides of a rhombus are parallel to each other.

So, we have

3a = 4a - 14

Evaluate

a = 14

This means that

QP = 3 * 14

QP = 42

In general, adjacent angles of a rhombus are supplementary, which means they add up to 180 degrees.

So, we have

QRS = 180 - 78

QRS = 102

Divide by 2

QRP = 102/2

QRP = 51

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The optimal solution is to cut the wire into two pieces, one forming a square with side length x = 2/π feet, and the other forming a circle with radius r = (1 - 4/π)/π feet.

A two-dimensional figure's area is the amount of space it takes up. In other terms, it is the amount that counts the number of unit squares that span a closed figure's surface.

Let's first start by noting the formulas for the area of a circle and the area of a square in terms of their radius/length:

Area of circle = πr²

Area of square = x²

We also know that the total length of the wire is 2 feet, so the sum of the circumference of the circle and the perimeter of the square must equal 2:

Circumference of circle = 2πr

Perimeter of square = 4x

2πr + 4x = 2

Simplifying this equation, we get:

πr + 2x = 1

We want to maximize the sum of the areas of the circle and square, which is given by:

πr² + x²

We can use the equation we just derived to eliminate r from this expression:

π(1 - 2x)²/4 + x²

Expanding and simplifying this expression, we get:

(π/4)x² - πx + π/4

To find the value of x that maximizes this expression, we need to take the derivative with respect to x and set it equal to zero:

d/dx [(π/4)x² - πx + π/4] = (π/2)x - π = 0

Solving for x, we get:

x = 2/π

Now we can use the equation we derived earlier to find the corresponding value of r:

πr + 2x = 1

πr + 4/π = 1

πr = 1 - 4/π

r = (1 - 4/π)/π

So, the optimal solution is to cut the wire into two pieces, one forming a square with side length x = 2/π feet, and the other forming a circle with radius r = (1 - 4/π)/π feet.

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To show that det U = 1, we can use the fact that U'U = I, which implies that U^-1 = U'. Taking the determinant of both sides, we have det U^-1 = det(U') = (det U)^T, where T denotes transpose. But det(U') = det U since U is a square matrix. Therefore, (det U)^2 = det(U'U) = det(I) = 1. Taking the positive square root, we get det U = 1 or -1.

However, the problem statement specifies that det U = 11, which is not possible since det U can only be 1 or -1 for a matrix satisfying U'U = I. Therefore, there must be an error in the problem statement.
To show that det U = 1 when U'U = I. Here's the answer using the provided terms:

Since U'U = I, we can apply the determinant to both sides of the equation:

det(U'U) = det(I)

Now, we use the property that det(AB) = det(A) * det(B), so:

det(U') * det(U) = det(I)

The determinant of the identity matrix is 1, so:

det(U') * det(U) = 1

For an orthogonal matrix like U, det(U') = det(U)^(-1), therefore:

det(U)^(-1) * det(U) = 1

Since det(U)^(-1) * det(U) = 1, it implies that det(U) = 1.

So, the correct option to achieve the desired result is B. det(U') * det(U) = 1.

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The solution to the initial value problem is y(t) = (25/3)e^(-t) - (5/3)e^(-4t).

The general solution of the differential equation y^(4) + 4y''' + 4y'' = 0 is y(t) = c1 + c2t + c3e^(-t) + c4te^(-t).

To solve the initial value problem, we first find the roots of the characteristic equation:

Using the quadratic formula, we get:

So the general solution of the differential equation is:

Using the initial conditions y(0) = 5 and y'(0) = -6, we can solve for c1 and c2:

Solving this system of equations, we get:

So the solution to the initial value problem is:

To find the general solution of the differential equation y^(4) + 4y''' + 4y'' = 0, we first find the characteristic equation:

This can be factored as:

So the roots are:

Therefore, the general solution is:

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Answer:

Step-by-step explanation:

[tex]y=14.99x+25[/tex]

The Maclaurin polynomial of degree 4 for the function g(x) = (sin(x))/x, which is an approximation of the function that is accurate up to the fourth degree.

To find the Maclaurin polynomial of degree 4 for the function g(x) = (sin(x))/x using the result in part (a) and the Maclaurin polynomial of degree 5 for f(x) = sin(x), we can use the following steps:

Recall that the Maclaurin series for sin(x) is given by:

sin(x) = x - (x^3)/3! + (x^5)/5! - (x^7)/7! + ...

We can divide both sides of the equation by x to obtain:

(sin(x)) / x = 1 - (x^2)/3! + (x^4)/5! - (x^6)/7! + ...

This expression is the Maclaurin series for the function g(x). However, it has an infinite number of terms. To find the Maclaurin polynomial of degree 4, we need to truncate the series after the fourth term.

Therefore, the Maclaurin polynomial of degree 4 for g(x) is:

g(x) ≈ 1 - (x^2)/3! + (x^4)/5! - (x^6)/7!

We can simplify this polynomial by evaluating the factorials in the denominator:

g(x) ≈ 1 - (x^2)/6 + (x^4)/120 - (x^6)/5040

This is the Maclaurin polynomial of degree 4 for the function g(x) = (sin(x))/x, which is an approximation of the function that is accurate up to the fourth degree.

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The system of inequalities is solved and the solutions are ( -5, - 2 )

Given data ,

Let the first inequality be A , 3x+2y≥-19

Let the second inequality be B , x+3y<-11

On simplifying , we get

The solution to the inequality is the point of intersection of the graph

Now , on plotting the graph , we get

The point of intersection is P ( -5 , -2 ) and the solution is point P

And , the points which are not a solution is Q ( 1 , -5 ) , ( 0 , 0 )

Hence , the system of inequalities are solved

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Answer:

This statement is not entirely correct. A greedy algorithm is a type of algorithm that makes locally optimal choices at each step in the hope of finding a global optimum. However, not all greedy algorithms are guaranteed to find an optimal solution, and some may only find a feasible solution that is not optimal.

In general, a greedy algorithm may not always produce an optimal solution, but it can often provide a good approximation for some optimization problems. Greedy algorithms are useful in problems where finding an optimal solution is computationally infeasible, and a near-optimal solution is sufficient.

Therefore, a greedy algorithm does not necessarily need to find an optimal solution to be considered as a greedy algorithm. It only needs to make locally optimal choices at each step, which may or may not lead to an optimal solution.

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The dimension of the subspace spanned by the given vectors is 2.

To find the dimension of the subspace spanned by the given vectors, you need to determine their linear independence. The vectors are:

v1 = [1, -2, 0]
v2 = [-3, 4, 1]
v3 = [-8, 6, 5]
v4 = [-3, 0, 7]

Form a matrix with these vectors as columns:

M = |  1  -3  -8  -3 |
    | -2   4   6   0 |
    |  0   1   5   7 |

Now, perform Gaussian elimination to find the reduced row echelon form (RREF) of the matrix:

RREF(M) = | 1  0  -2  1 |
                 | 0  1   5  7 |
                 | 0  0   0  0 |

The rank of the matrix is the number of non-zero rows in the RREF, which is 2 in this case.

Therefore, the dimension of the subspace spanned by the given vectors is 2.

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The poster dimensions are 18 inches by 39 inches, or (18, 39).

We know that Megan cuts out a rectangle with dimensions,
The remaining paper is used to wrap an 11-inch cube with no paper wasted, and there are 3 square inches left over.

Multiplying by 6 to eliminate fractions, we get:
6ab - ab - 15a - 2b + 180 = 7980
Rearranging and factoring, we get:
(5a - b)(a - 6) = 7640
Since b>a, we know that 5a-b must be positive, and thus a-6 must also be positive.

Therefore, we can set up a system of equations:
5a - b = x
a - 6 = [tex]\frac{7640}{x}[/tex]
Solving for a and b, we get:

b = 5a - x
We know that the difference between the length and width of the poster is less than 50, so we can set up an inequality:
The remaining wrapping paper has an area equal to the original poster area minus the cutout area.

We know that the remaining paper is used to wrap an 11-inch cube, which has a surface area of 6(22)=726 square inches, and there are 3 square inches leftover.
Now, we are given that b>a and b-a<50. We can start by testing different integer values for a and b within the given range to see which pair of values satisfies the equation.
After testing values, we find that (a, b) = (18, 39) is the solution that satisfies the equation and the given constraints.

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Answer: The missing sides measure 3.1 and 5.2cm.

Step-by-step explanation: If the longest side of the triangle measured 6.2cm, and was twice as long as the shortest side, we should divide 6.2 by 2. Our shortest side is 3.1cm and our longest 6.2cm. The perimeter is 14.5, so we add up 6.2 and 3.1 to get 9.3, and then subtract that from 14.5. 14.5 - 9.3 = 5.2, so all the sides are 3.1, 5.2, and 6.2cm. We can be sure that this is the answer when we add 3.1 + 5.2 + 6.2 it equals 14.5. The sides of a scalene triangle all have different sides, so this is correct. If you give your answer choices I can tell you which is correct also.

The graph of the parabola for the quadratic function, f(x) = x² -12·x + 27, with the vertex point (6, -9), and the y-intercept, (0, 27), created with MS Excel is attached, please find

The x-coordinates of the vertex of the parabola with an equation of the form; f(x) a·x² + b·x + c are;

-b/(2·a)

The specified quadratic function is f(x) = x² - 12·x + 27

Therefore, a = 1, b = -12, and c = 27

The x-coordinate of the vertex is; x = -(-12)/(2 × 1) = 6

The y-coordinate of the vertex is therefore;

f(6) = 6² - 12 × 6 + 27 = -9

The coordinate of the vertex is therefore; (6, -9)

A point on the graph, such as the y-intercept can be found as follows;

f(0) = 0² - 12 × 0 + 27 = 27

The y-intercept of the graph is (0, 27)

Please find attached the graph of the parabola of the function f(x) = x² - 12·x + 27, created with MS Excel

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Answer:

(-4, -3)

Step-by-step explanation:

When a point is reflected in the x-axis, the x-coordinate does not change, and the y-coordinate becomes negative:

Therefore, if point P(3, 4) is reflected in the x-axis, then:

When a point is rotated 90° clockwise about the origin, it produces a point that has the coordinates (y, -x):

Therefore, if point P'(3, -4) is rotated 90° clockwise about the origin, then:

(a) The probability that you lose your place in line during the 5-minute break is 28.35%. (b) The probability that zero, one, or two arrivals will come during your five minute rest break is 99.34%.

(a) The probability that you will lose your place is equal to probability that at least one person arrives during this time. Let X be number of arrivals during 5-minute break. Then X follows a Poisson distribution with a mean of (1/15) × 5 = 1/3 arrivals during 5-minute break.

Thus, the probability that you lose your place in line during the 5-minute break is:

P(X ≥ 1) = 1 - P(X = 0)

= 1 - (e^(-1/3) (1/3)^0 / 0!)

≈ 0.2835

Therefore, the chance that you lose your place in line during the 5-minute break is approximately 28.35%.

(b) The number of arrivals during the 5-minute break follows a Poisson distribution with a mean of 1/3 arrivals.

P(X = 0) = e^(-1/3) (1/3)^0 / 0! ≈ 0.7165

P(X = 1) = e^(-1/3) (1/3)^1 / 1! ≈ 0.2388

P(X = 2) = e^(-1/3) (1/3)^2 / 2! ≈ 0.0381

Therefore, the probability that zero, one, or two arrivals will come during your five-minute rest break is approximately:

P(X ≤ 2) = P(X = 0) + P(X = 1) + P(X = 2)

≈ 0.9934

Thus, the probability that at most two arrivals will come during your break is approximately 99.34%.

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Part 1: Yes, all squares have 2 pairs of parallel sides.

Part 2: No, not all rectangles have 4 congruent sides.

Part 1: This is because all squares are rectangles, and all rectangles have 2 pairs of parallel sides. Additionally, since all four sides of a square are congruent, this means that the two pairs of sides are also congruent, making them parallel.

Part 2: While all squares are rectangles with 4 congruent sides, rectangles can have two pairs of parallel sides that are not congruent. For example, a rectangle with a length of 5 units and a width of 3 units has two pairs of parallel sides, but they are not congruent.

One pair of sides is longer than the other pair. Therefore, the fact that all squares are rectangles with 4 congruent sides does not mean that all rectangles have 4 congruent sides.

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The hours taken to reach the top of Jebel Jais is 7 hours, while trekking at a rate of 300 meters per hour.

Assuming that the tallest mountain in the UAE is Jebel Jais, which stands at an altitude of 1,934 meters, you would need approximately 6.45 hours to reach the top.
To calculate this, you need to divide the total altitude of the mountain by your trekking speed, which is 300 meters per hour.

Therefore, 1,934 meters divided by 300 meters per hour equals 6.45 hours.
However, this calculation is just an estimation as it doesn't take into account factors such as terrain difficulty, weather conditions, and rest breaks.

It's essential to consider these factors when planning a trek to ensure your safety and enjoyment.
Therefore, before embarking on a trek, it's crucial to research the mountain's topography, difficulty level, and weather conditions.
The trekking on the tallest mountain in the UAE can be a challenging but rewarding experience.

With proper planning and preparation, you can reach the top and enjoy the breathtaking views from the summit.
The height of the tallest mountain in the UAE: Jebel Jais is the tallest mountain in the UAE, with an elevation of 1,934 meters.
The number of hours needed: Divide the mountain's height (1,934 meters) by your trekking speed (300 meters per hour).

1,934 meters ÷ 300 meters per hour ≈ 6.45 hours

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Answer: 54n. If n = 20, the expression is equal to 1,080.

Step-by-step explanation:

    To simplify we will combine like terms, as the information given suggests, then we will substitute the given and evaluate.

Given:

   31n + 5n - n + 19n

Add 5n to 31n:

   36n - n + 19n

Subtract n from 36n:

   35n + 19n

Add 19n to 35n:

   54n

Substitute if n = 20:

   54(20)

Multiply:

   1,080

[tex] \dfrac{10}{120} = \dfrac{5.2}{x} \\ \\ x = \dfrac{5.2 \times 120}{10} \\ \\ x = 5.2 \times 12 = \red{\fbox{\pink{62.4}}}[/tex]

Height of tree = 62ft and 4inch

For any other value of a, the vectors −→v = ha 2 , 6i and −→w = h4a, 2i are not parallel.

What is vector?

A vector is a mathematical object that has both magnitude and direction. In physics and engineering, vectors are often used to represent physical quantities such as velocity, force, and acceleration.

Two vectors are parallel if they are scalar multiples of each other, i.e., if one vector is a multiple of the other.

To check if the vectors −→v = ha 2 , 6i and −→w = h4a, 2i are parallel, we can find the scalar k such that:

−→w = k −→v

Using the component form of the vectors, we get:

h4a, 2i = k h a 2 , 6i

This gives us the following system of equations:

4a = ka

2 = 6k

Solving for k in the second equation, we get:

k = 2/6 = 1/3

Substituting k = 1/3 in the first equation, we get:

4a = (1/3) a

Multiplying both sides by 3, we get:

12a = a

Simplifying, we get:

11a = 0

Therefore, the only solution is a = 0.

Thus, for any other value of a, the vectors −→v = ha 2 , 6i and −→w = h4a, 2i are not parallel.

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There are no values of c in the interval where f'(c) = 0. Therefore, the answer is C = (no values)

To use Rolle's theorem, we need to check that the function is continuous on the closed interval [-4,2] and differentiable on the open interval (-4,2). Both conditions are satisfied by f(x) = (2x³ + 21x - 2)/2, so we can proceed with finding the values of c where f'(c) = 0.

First, we find the derivative of f(x):
f'(x) = 6x² + 21/2

Next, we set f'(x) = 0 and solve for x:
6x² + 21/2 = 0
6x² = -21/2
x² = -7/4
x = ±√(-7/4) = ±(i√7)/2

Since these values are not in the given interval (-4,2], we conclude that the correct option is C.

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The points on the curve where the tangent is horizontal: (1, 0) & (-1, 0),  and where the tangent is vertical: (0, 1) & (0, -1)

To find the points on the curve x=cos(theta) where the tangent is horizontal or vertical, we need to find the derivative of x with respect to theta.

Taking the derivative of x with respect to theta, we get:

dx/dtheta = -sin(theta)

When the tangent is horizontal, the derivative is equal to zero. So we need to solve the equation -sin(theta) = 0 for theta.

This equation is true when theta = n*pi, where n is an integer. So the points on the curve x=cos(theta) where the tangent is horizontal are:

(1, 0) for n=2k, where k is an integer

(-1, 0) for n=2k+1, where k is an integer

When the tangent is vertical, the derivative is undefined. This happens when cos(theta) = 0, which is true when theta = (2k+1)*pi/2, where k is an integer.

So the points on the curve x=cos(theta) where the tangent is vertical are:

(0, 1) for n=2k+1, where k is an integer

(0, -1) for n=2k, where k is an integer

Therefore, the points on the curve where the tangent is horizontal are (1, 0) and (-1, 0), and the points on the curve where the tangent is vertical are (0, 1) and (0, -1).

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[tex] \Large{\boxed{\sf x = -\dfrac{1}{2} \: \: or \: \: x = \dfrac{3}{2}}} [/tex]

[tex] \\ [/tex]

Given equation:

[tex] \sf x^2 - x - \dfrac{3}{4} = 0[/tex]

[tex] \\ [/tex]

Since the highest power of the variable "x" is 2, the equation is a quadratic equation.

We generally solve that kind of equation using the quadratic formula, which is the following:

[tex] \sf x = \dfrac{ - b \pm \sqrt{b^{2} - 4ac}}{2a} [/tex]

We will find the value of the coefficients a,b, and c by comparing our equation to the standard form of a quadratic equation:

[tex] \sf a {x}^{2} + bx + c = 0 \: , where \: a \neq 0.[/tex]

We get:

[tex] \bullet \sf \: a = 1 \: \: \\ \\ \bullet \sf \: b = - 1 \\ \\ \bullet \sf \: c = - \dfrac{3}{4} [/tex]

[tex] \\ [/tex]

Now, let's plug these values in our formula.

[tex] \sf x = \dfrac{ - ( - 1) \pm \sqrt{ { ( - 1)}^{2} - 4(1)( - \frac{3}{4}) }}{2(1)} \\ \\ \\ \implies \sf x = \dfrac{1 \pm \sqrt{1 - ( - 3)}}{2} = \dfrac{1 \pm \sqrt{4}}{2} = \dfrac{1 \pm 2}{2} [/tex]

[tex] \\ [/tex]

Therefore, our solutions will be:

[tex] \sf x_1 = \dfrac{1 - 2}{2} = \boxed{ \sf - \dfrac{1}{2}} \: \: and \: \: x_2 = \dfrac{1 + 2}{2} = \boxed{ \sf \dfrac{3}{2} }[/tex]

[tex] \\ \\ [/tex]

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Using the identity sin² t + cos² t = 1, we can simplify this equation: x² + y² = 4 + 4 - 4 sin t, x² + y² = 8 - 4 sin t. So the equation for the circle traced out by these parametric equations is x² + y² = 8 - 4 sin t.

The parametric equations given are:

x = 2cos(t), y = 2 - sin(t)

To find the equation for the curve traced out by these parametric equations, we can eliminate the parameter t by solving one equation for t and then substituting it into the other equation.

First, let's solve for t in the x equation:
x = 2cos(t) → cos(t) = x/2

Now we find sin(t) using the identity sin²(t) + cos²(t) = 1:
sin²(t) = 1 - cos²(t) → sin(t) = ±√(1 - cos²(t)) = ±√(1 - (x/2)²)

Since y = 2 - sin(t), we can substitute sin(t) into the y equation:
y = 2 ± √(1 - (x/2)²)

This equation represents the curve traced out by the given parametric equations.

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