find the infinite sum (if it exists): ∑i=0[infinity]10⋅(9)i if the sum does not exists, type dne in the answer blank.

We have proved that if b and d are odd, then f is odd, but the statement that if b and d are even, then f is even is false.

a. If b and d are odd, then f is odd.

Proof:

Since q and r are written in lowest terms, a and b are coprime, and c and d are coprime. Therefore, we have:

ad - bc = 1 (by the definition of lowest terms)

Multiplying both sides by bf, we get:

adf - bcf = f

Similarly, we have:

bf = bd (since b and d are coprime)

df = bd (since s=q+r=a/b+c/d=(ad+bc)/(bd))

Substituting these values in the previous equation, we get:

adf - (s-b)bd = f

adf - sbd + b^2d = f

Since b and d are odd, b²d is odd as well. Therefore, f is odd if and only if adf - sbd is odd. But adf - sbd is the product of three odd numbers (since a, b, c, and d are all odd), which is odd. Therefore, f is odd.

b. If b and d are even, then f is even.

Counterexample:

Let q = 1/2 and r = 1/2. Then s = 1, which can be written as e/f for any odd f. For example, if f = 3, then e = 3 and s = 1/2 + 1/2 = 3/6, which is written in lowest terms as 1/2. Therefore, the statement is false.

Thus, we have proved that if b and d are odd, then f is odd, but the statement that if b and d are even, then f is even is false.

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Okay, here are the steps to solve this problem:

1) Since ACDE is isosceles with base EC, the angles at the base (mECD and mCEA) are equal. Let's call this common angle measure θ.

2) We know: mZD = (2x + 42)°

So, (2x + 42) + θ = 180° (angles sum to 180° in a triangle)

2x + 42 + θ = 180

=> 2x = 138

=> x = 69

3) Substitute x = 69 into mZE = (4x + 14)°

=> mZE = (4(69) + 14) = 278°

4) Now we have all 3 angles:

mECD = mCEA = θ (these are equal, common base angle)

mZD = (2)(69) + 42 = 174°

mZE = 278°

5) As a check:

174 + 278 + θ = 180

θ = 128

So the degree measures of the angles are:

mECD = mCEA = 128° (common base angle)

mZD = 174°

mZE = 278°

Let me know if you have any other questions! I'm happy to explain further.

Answer:

a. 24!/19! = 24 × 23 × 22 × 21 × 20

= 5,100,480

b. P[10, 6] = 10!/4! = 10 × 9 × 8 × 7 × 6 × 5

= 151,200

c. C[8, 6] = 8!/(6!2!) = (8 × 7)/(2 × 1) = 56/2

= 28

The value of the factorials and combinations are
a. 24!/19! = 2,401,432,640
b. P[10,6] = 151,200
c. C[8,6] = 28


a. To solve 24!/19!, divide the factors of 24! from 20 to 24 by the factors of 19! (1 to 19). So, 24!/19! = 20 × 21 × 22 × 23 × 24 = 2,401,432,640.
b. P[10,6] represents the number of permutations of 10 items taken 6 at a time. Calculate using the formula P(n, r) = n!/(n-r)!. In this case, P(10,6) = 10!/(10-6)! = 10! / 4! = 151,200.
c. C[8,6] represents the number of combinations of 8 items taken 6 at a time. Calculate using the formula C(n, r) = n!/(r!(n-r)!). In this case, C(8,6) = 8!/(6!(8-6)!) = 8!/(6! × 2!) = 28.

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The kinetic energy of the particle is K = p^2/(2m).

The magnitude of the particle's momentum is p = sqrt(2mK).

.

(a) To show that the kinetic energy of the particle is K = p^2 / (2m), we can start by defining the relationship between momentum and velocity:

p = mv, where m is the mass and v is the velocity.

Next, let's define kinetic energy as :

K = 1/2 mv^2.

Now, we want to express v in terms of p and m:

v = p / m

Substitute this expression for v into the kinetic energy equation:

K = 1/2 m (p / m)^2
K = 1/2 m (p^2 / m^2)
K = p^2 / (2m)

So, the kinetic energy of the particle is K = p^2 / (2m).

(b) To express the magnitude of the particle's momentum in terms of its kinetic energy and mass, we can rearrange the equation we derived in part (a):

p^2 = 2mK

Now, take the square root of both sides:

p = sqrt(2mK)

So, the magnitude of the particle's momentum is p = sqrt(2mK).

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The kinetic energy of the particle is K = p^2/(2m).

The magnitude of the particle's momentum is p = sqrt(2mK).

.

(a) To show that the kinetic energy of the particle is K = p^2 / (2m), we can start by defining the relationship between momentum and velocity:

p = mv, where m is the mass and v is the velocity.

Next, let's define kinetic energy as :

K = 1/2 mv^2.

Now, we want to express v in terms of p and m:

v = p / m

Substitute this expression for v into the kinetic energy equation:

K = 1/2 m (p / m)^2
K = 1/2 m (p^2 / m^2)
K = p^2 / (2m)

So, the kinetic energy of the particle is K = p^2 / (2m).

(b) To express the magnitude of the particle's momentum in terms of its kinetic energy and mass, we can rearrange the equation we derived in part (a):

p^2 = 2mK

Now, take the square root of both sides:

p = sqrt(2mK)

So, the magnitude of the particle's momentum is p = sqrt(2mK).

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The length of the diagonal of the rectangular box is[tex]\sqrt{51}[/tex] inches.

Using the Pythagorean theorem, we can find the length of the diagonal of the rectangular box.

given that height of rectangular box is 5 inches, base is  1 inches, and length is 5 inches.

Lets join base diagonal of rectangular box ,and its denoted by 'a'

then to find diagonal value :

[tex]a^{2}=5^{2}+1^{2} \\a^{2}=25+1\\ a^{2} =26\\a=\sqrt{26}[/tex]

now lets say length of straw is l  ,then by  Pythagorean theorem

we have ,

[tex]l^{2} =a^{2}+heigth^{2} \\l^{2}= 26+5^{2}\\ l^{2}=25+26\\ l^{2}=51\\ l=\sqrt{51} \\[/tex]

So the length of the diagonal of the rectangular box is[tex]\sqrt{51}[/tex] inches. Since the straw fits exactly into the box diagonally from the bottom left corner to the top right back corner, the length of the straw is also    [tex]\sqrt{51}[/tex]  inches.

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To prepare a 10mL of a 0.050M sucrose solution, we need to take 5mL of the 0.10M sucrose solution and dilute it with 5mL of distilled water.

To prepare a 10mL of a 0.050M sucrose solution from a 0.10M solution, we need to dilute the original solution.

The formula for dilution is:

C₁V₁ = C₂V₂

Where:

C₁ = initial concentration of the solution

V₁ = initial volume of the solution

C₂ = final concentration of the solution

V₂ = final volume of the solution

Substituting the given values, we get:

(0.10M) (V1) = (0.050M) (10mL)

Solving for V₁, we get:

V₁ = (0.050M) (10mL) / (0.10M)

V₁ = 5mL

This will result in a total volume of 10mL and a final concentration of 0.050M.

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Answer:

-8>x

Step-by-step explanation:

-64>8x

divide each side by 8 to get x alone

-8>x

Step-by-step explanation:

It can be written as log_4(5x+4)=3

to do this take the log base 4 on both sides

and according to the log rule (log(A)^B) can be written as B×log(A)

we can do the same thing and rewrite

log_4(4)³ as 3×log_4(4) log_4(4) can cancel

out to be one so we are left with 3 × 1 which

is just 3

this will leave 3 to be equal to log_4(5x+4)

to solve this equation for x

4³ = (5x+4)

64= 5x+4

-4 -4

60= 5x

divide both sides by 5

we get

x = 12

We add 1 and 3/2 to get 5/2, which is the remainder. According to the Remainder Theorem, this is the value of P(c). Therefore, P(1/2) = 5/2.

To use synthetic division and the Remainder Theorem to evaluate P(c), we first set up the synthetic division table with the constant term of P(x) as the divisor and c as the value we want to evaluate:

1/2 | 2   9   4
   |_______
   
Next, we bring down the leading coefficient 2:

1/2 | 2   9   4
   |_______
       2

Then, we multiply c (1/2) by 2 and write the result under the next coefficient:

1/2 | 2   9   4
   |_______
       2   1

We add 2 and 1 to get 3, and then multiply c by 3 to get 3/2 and write it under the last coefficient:

1/2 | 2   9   4
   |_______
       2   1
           3/2

We add 1 and 3/2 to get 5/2, which is the remainder. According to the Remainder Theorem, this is the value of P(c). Therefore, P(1/2) = 5/2.

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The exponential form of the equation log_z(w) = p is z^p = w, which states that if the logarithm of w to the base z is equal to p, then z raised to the power of p is equal to w.

The logarithm of a number w to a given base z is the power to which the base z must be raised to obtain w. Mathematically, it can be represented as log_z(w), where z is the base, w is the number being evaluated, and the result is the exponent to which z must be raised to obtain w.

In the equation log_z(w) = p, we are given the logarithm of w to the base z, which is equal to p. We can rearrange this equation to obtain the exponential form by isolating the base z. To do this, we raise both sides of the equation to the power of z

z^log_z(w) = z^p

On the left side of the equation, we have the base z raised to the logarithm of w to the base z. By definition, this is equal to w. Therefore, we can simplify the left side of the equation to obtain

w = z^p

This is the exponential form of the equation. It states that z raised to the power of p is equal to w. In other words, if we know the logarithm of w to the base z, we can find the value of w by raising z to the power of the logarithm.

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The given question is incomplete, the complete question is:

Write the equation in exponential form. Assume that all constants are positive and not equal to 1. log_z (w) = p

We can successfully multiplied n by 35 using only five multiplications by 2, two additions, and intermediate storage of results.

We can use the following sequence of operations:

Multiply n by 4 using two multiplications by 2.

Multiply n by 8 using three multiplications by 2.

Add the result of step 1 to the result of step 2 using one addition.

Multiply n by 2 using one multiplication by 2.

Add the result of step 3 to the result of step 4 using one addition.

Multiply the result of step 5 by 4 using two multiplications by 2.

Add the result of step 5 to the result of step 6 using one addition.

The final result is n × 35.

Here's how it works:

Step 1: 4n

Step 2: 8n

Step 3: 4n + 8n = 12n

Step 4: 24n

Step 5: 12n + 24n = 36n

Step 6: 144n

Step 7: 36n + 144n = 180n

So, we have successfully multiplied n by 35 using only five multiplications by 2, two additions, and intermediate storage of results.

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The first step to solve for slope intercept form of a linear equation, - x + 4y = 11, is add x to both sides. So, the option(b) is right answer for problem.

The slope intercept form of a linear equation is written as, y = mx + b, where 'm' is the slope of the straight line and 'b' is the y-intercept and (x, y) represent every point on the line x and y have to be kept as the variables while applying the above formula. It is involved only a constant and a first-order (linear) term.

We have a linear equation, - x + 4y = 11 --(2). To write slope intercept form of equation (2), we take dependent variable, y in one side and remaining on other sides. That is add x both sides, 4y

= 11 + x

dividing by 4 both sides

=> [tex] y = \frac{ 11}{4} + \frac{ x }{4}[/tex]

Comparing the equation (1) and equation (2) we can having, slope, m = 11/4 and b = 1. This is the required form. Therefore, the first step to determine required results is addition of x both sides.

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The area A of the triangle with the given vertices (0,0), (4,2), and (1,7) is 13 square units.

To find the area A of the triangle with the given vertices (0,0), (4,2), and (1,7) using calculus, we can apply the Shoelace Theorem formula, which is:

A = (1/2) * |Σ(x_i * y_i+1 - x_i+1 * y_i)|, where i ranges from 1 to n (number of vertices) and the last vertex is followed by the first one.

Let's apply this formula to our vertices:

A = (1/2) * |(0 * 2 - 4 * 0) + (4 * 7 - 1 * 2) + (1 * 0 - 0 * 7)|

A = (1/2) * |(0) + (28 - 2) + (0)|

A = (1/2) * |26|

A = 13 square units

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The general solution to Ax=b can be written as:

x = [2,2,6] T + c1*[1,1,2] T + c2*[1,0,-1] T

where c1 and c2 are arbitrary constants

Since the vectors z1 and z2 form a basis for the null space of A, any solution to Ax=0 can be expressed as a linear combination of these vectors. In other words, if x is a vector in N(A), then x can be written as:

x = c1z1 + c2z2

where c1 and c2 are constants.

To find all solutions to Ax=b, we can first find a particular solution xp to Ax=b using any method such as Gaussian elimination or inverse matrix. Then, the general solution to Ax=b can be written as:

x = xp + c1z1 + c2z2

where c1 and c2 are constants.

Let's first find a particular solution xp to Ax=b. We have:

A = [a1, a2, a3]

b = a1 + 2*a2 + a3

We want to find a vector xp such that Axp = b. We can write xp as:

xp = c1z1 + c2z2

where c1 and c2 are constants to be determined. Substituting xp into the equation Axp = b, we get:

c1a1 + c2a2 = -a3

Since the vectors z1 and z2 form a basis for N(A), we know that a linear combination of a1, a2, and a3 is equal to zero if and only if the coefficients of the linear combination satisfy the equation:

c1z1 + c2z2 = 0

In other words, we have:

c1*[1,1,2] T + c2*[1,0,-1] T = [0,0,0] T

This gives us the system of linear equations:

c1 + c2 = 0

c1 + 2c2 = 0

2c1 - c2 = 0

Solving this system of equations, we get:

c1 = 2

c2 = -2

Substituting these values into the equation xp = c1z1 + c2z2, we get:

xp = 2*[1,1,2] T - 2*[1,0,-1] T = [2,2,6] T

So, a particular solution to Ax=b is xp = [2,2,6] T.

Therefore, the general solution to Ax=b can be written as:

x = [2,2,6] T + c1*[1,1,2] T + c2*[1,0,-1] T

where c1 and c2 are arbitrary constants

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a) The number of heads that occur on flip i, Xi, follows a Bernoulli distribution with parameter p. Therefore, the probability mass function (PMF) of Xi is given by:

P(Xi = x) = p^x(1-p)^(1-x), for x = 0,1

To find PX33(x), we need to compute the probability that X33 takes on the value x. Since each flip is independent, we can use the PMF of Xi to compute the joint PMF of X1, X2, ..., X100:

P(X1 = x1, X2 = x2, ..., X100 = x100) = p^(x1 + x2 + ... + x100) (1-p)^(100 - x1 - x2 - ... - x100)

Now, we can use the fact that the events X1 = x1, X2 = x2, ..., X100 = x100 are mutually exclusive and exhaustive (since each flip can only have two possible outcomes), and use the law of total probability to compute PX33(x):

PX33(x) = ∑ P(X1 = x1, X2 = x2, ..., X100 = x100), where the sum is taken over all possible combinations of x1, x2, ..., x100 that satisfy x33 = x.

Since we are only interested in the value of X33, we can fix x33 = x and sum over all possible combinations of x1, x2, ..., x32 and x34, x35, ..., x100 that satisfy the condition:

x1 + x2 + ... + x32 + x34 + ... + x100 = 100 - x

This is the same as flipping a biased coin 99 times and counting the number of heads that occur. Therefore, we have:

PX33(x) = P(X = 100 - x) = p^(100-x) (1-p)^x

b) X1 and X2 are independent if the outcome of X1 does not affect the outcome of X2. Since each flip is independent, X1 and X2 are also independent.

c) Y = X1 + X2 + ... + X1000 follows a binomial distribution with parameters n = 1000 and p, where p is the probability of getting a head on each flip. Therefore, the PMF of Y is given by:

PY(y) = C(1000,y) p^y (1-p)^(1000-y), for y = 0,1,2,...,1000

where C(n,k) denotes the binomial coefficient.

d) The expected value of Y is:

E[Y] = E[X1 + X2 + ... + X1000] = E[X1] + E[X2] + ... + E[X1000] (by linearity of expectation)

Since each Xi has the same distribution, we have:

E[Xi] = p*1 + (1-p)*0 = p

Therefore, E[Y] = 1000p.

The variance of Y is:

Var[Y] = Var[X1 + X2 + ... + X1000] = Var[X1] + Var[X2] + ... + Var[X1000] + 2 Cov[Xi, Xj]

Since each Xi has the same distribution, we have:

Var[Xi] = p(1-p)

and

Cov[Xi, Xj] = 0 for i ≠ j, since Xi and Xj are independent.

Therefore, we have:

Var[Y] = 1000p(1-p)

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The amount of money we can make is $0.05.

We have,

P= $710

R= 5.1%

T= 12 year

Compounded Continuously:

A = P[tex]e^{rt[/tex]

A = 710.00(2.71828[tex])^{(0.051)(12)[/tex]

A = $1,309.32

Compounded Daily:

A = P(1 + r/n[tex])^{nt[/tex]

A = 710.00(1 + 0.051/365[tex])^{(365)(12)[/tex]

A = 710.00(1 + 0.00013972602739726[tex])^{(4380)[/tex]

A = $1,309.27

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Okay, let's solve this step-by-step:

* The box is shaped like a rectangular prism

* It has dimensions:

** 18.5 inches long

** 32 inches wide

** 12.2 inches deep

To find the volume of a rectangular prism, we use the formula:

Volume = Length x Width x Depth

So in this case:

Volume = 18.5 inches x 32 inches x 12.2 inches

= 18.5 * 32 * 12.2

= 5796 cubic inches

Therefore, the volume of the box is 5796 cubic inches.

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The p-value for the given test statistic z0=-2.57 is 0.995.

Identify the given information: The null hypothesis (H0) is μ=5, the alternative hypothesis (H1) is μ<5, and the test statistic is z0=-2.57.

Determine the tail of the distribution: Since the alternative hypothesis is one-sided (μ<5), we are interested in the left tail of the standard normal distribution.

Find the cumulative distribution function (CDF): Using a standard normal distribution table or a calculator, find the cumulative distribution function (CDF) for the test statistic z0=-2.57. The CDF represents the probability that a standard normal random variable is less than or equal to a given value.

Calculate the p-value: Since the test statistic is in the left tail, the p-value is the probability of obtaining a value as extreme or more extreme than z0=-2.57 in the left tail of the standard normal distribution. This can be calculated as 1 - CDF(z0), where CDF(z0) is the cumulative distribution function for z0=-2.57.

Substitute the value of z0=-2.57 into the formula: p-value = 1 - CDF(-2.57).

Use a standard normal distribution table or a calculator to find the CDF for z0=-2.57. Let's assume the CDF is 0.005 (this is just an example, actual values may vary).

Substitute the CDF value into the formula: p-value = 1 - 0.005 = 0.995.

Interpret the result: The calculated p-value of 0.995 represents the probability of obtaining a test statistic as extreme or more extreme than z0=-2.57 under the null hypothesis. Therefore, if the significance level (α) is less than 0.995, we would reject the null hypothesis in favor of the alternative hypothesis at the given level of significance.

Therefore, the p-value for the given test statistic z0=-2.57 is 0.995.

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The probability that in a random sample of five North American adults, all watch television for more than 7 hours per day is 0.000793 or approximately 0.08%.

a. To find the probability that a randomly selected North American adult watches television for more than 7 hours per day, we need to calculate the z-score and then use a standard normal distribution table or calculator.

z-score = (7 - 6) / 1.5 = 0.67

Using a standard normal distribution table or calculator, we find that the probability of a z-score greater than 0.67 is 0.2514. Therefore, the probability that a randomly selected North American adult watches television for more than 7 hours per day is 0.2514.

b. The distribution of the sample mean is also normal with mean = 6 and standard deviation = 1.5 / sqrt(5) = 0.67.

z-score = (7 - 6) / (1.5 / sqrt(5)) = 1.34

Using a standard normal distribution table or calculator, we find that the probability of a z-score greater than 1.34 is 0.0885. Therefore, the probability that the average time watching television by a random sample of five North American adults is more than 7 hours is 0.0885.

c. The probability that a single North American adult watches television for more than 7 hours is 0.2514 (from part a). The probability that all five adults in the sample watch television for more than 7 hours can be calculated using the binomial distribution:

P(X = 5) = (5 choose 5) * 0.2514^5 * (1 - 0.2514)^(5-5) = 0.000793

Therefore, the probability that in a random sample of five North American adults, all watch television for more than 7 hours per day is 0.000793 or approximately 0.08%.

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The sets of numbers that satisfy the theorem are:

d. 5, 7, 11

e. 3, 5, 11

Find three distinct prime numbers less than 12 that has sum is also prime. We can check each set of numbers given in the options to see if they satisfy the theorem.

a. 3, 9, 11

Sum = 23 (not prime)

Does not satisfy the theorem.

b. 3, 7, 13

Sum = 23 (not prime)

Does not satisfy the theorem.

c. 2, 3, 11

Sum = 16 (not prime)

Does not satisfy the theorem.

d. 5, 7, 11

Sum = 23 (prime)

Satisfies the theorem.

e. 3, 5, 11

Sum = 19 (prime)

Satisfies the theorem.

Therefore, the sets of numbers that satisfy the theorem are d and e.

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The values of the constants a, b, c, and d for the function [tex]f(x) = ax^3 + bx^2 + cx + d[/tex] that has a local maximum at (0,0) and a local minimum at (1,-1) are: a = 0, b = 0, c = 0, d = -1.

What is function?

In mathematics, a function is a relation between two sets in which each element of the first set (called the domain) is associated with a unique element of the second set (called the range). In other words, a function is a rule or a set of rules that assigns exactly one output for each input.

To find the values of the constants a, b, c, and d, we need to use the first and second derivatives of the function f(x).

First, we find the first derivative of f(x):

[tex]f'(x) = 3ax^2 + 2bx + c[/tex]

Next, we find the second derivative of f(x):

f''(x) = 6ax + 2b

Since f(x) has a local maximum at (0,0), we know that f'(0) = 0 and f''(0) < 0. Similarly, since f(x) has a local minimum at (1,-1), we know that f'(1) = 0 and f''(1) > 0.

Using these conditions, we can set up a system of equations to solve for a, b, c, and d:

f'(0) = 0 => c = 0

f''(0) < 0 => 2b < 0 => b < 0

f'(1) = 0 => 3a + 2b = 0

f''(1) > 0 => 6a + 2b > 0 => 3a + b > 0

Solving the third equation for a, we get:

a = -(2b/3)

Substituting this into the fourth equation, we get:

3a + b > 0

3(-(2b/3)) + b > 0

-b > 0

b < 0

Therefore, we have determined that b < 0.

Substituting a = -(2b/3) and c = 0 into the equation for f'(1) = 0, we get:

3(-(2b/3)) + 2b = 0

-2b = 0

b = 0

Therefore, we have determined that b = 0.

Substituting b = 0 into the equation for a, we get:

a = 0

Therefore, we have determined that a = 0.

Finally, using the condition that f(1) = -1, we can solve for d:

[tex]f(1) = a(1)^3 + b(1)^2 + c(1) + d = 0 + 0 + 0 + d = d = -1[/tex]

Therefore, we have determined that d = -1.

In summary, the values of the constants a, b, c, and d for the function [tex]f(x) = ax^3 + bx^2 + cx + d[/tex] that has a local maximum at (0,0) and a local minimum at (1,-1) are:

a = 0

b = 0

c = 0

d = -1

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Therefore, the linear system is consistent if and only if the bi's satisfy the condition: b + 4b2 ≠ 0.

For the linear system:

[tex]x_1 - 2x_2 + 5x_3 = b_1[/tex]

[tex]4x_1 - 5x_2 + 8x_3 = b_2[/tex]

[tex]-3x_1 + 3x_2 - 3x_3 = b_3[/tex]

We can write the system in the matrix form as AX = B, where

A = [1 -2 5; 4 -5 8; -3 3 -3],

X = [x1; x2; x3],

and B = [b1; b2; b3].

The system is consistent if and only if the rank of the augmented matrix [A|B] is equal to the rank of the coefficient matrix A. The augmented matrix is obtained by appending B to A as an additional column.

So, we form the augmented matrix:

[1 -2 5 | b1]

[4 -5 8 | b2]

[-3 3 -3 | b3]

We perform row operations to obtain the row echelon form of the matrix:

[1 -2 5 | b1]

[0 3 -12 | b2-4b1]

[0 0 0 | b3+3b1-3b2]

The rank of A is 3 because there are three nonzero rows in the row echelon form. So, the system is consistent if and only if the rank of [A|B] is also 3, which means that the third row must not be a pivot row. This gives us the condition:

[tex]b_3 + 3b_1 - 3b_2 = 0[/tex]

Therefore, the linear system is consistent if and only if the bi's satisfy the condition:

[tex]b_3 + 3b_1 - 3b_2 = 0[/tex]

For the linear system:

[tex]x_1 - 2x_2 - x_3 = b[/tex]

[tex]-4x_1 = b_2[/tex]

We can write the system in the matrix form as AX = B, where

A = [1 -2 -1; -4 0 0],

X = [x1; x2; x3],

and B = [b; b2].

The system is consistent if and only if the rank of the augmented matrix [A|B] is equal to the rank of the coefficient matrix A. The augmented matrix is obtained by appending B to A as an additional column.

So, we form the augmented matrix:

[1 -2 -1 | b]

[-4 0 0 | b2]

We perform row operations to obtain the row echelon form of the matrix:

[1 -2 -1 | b]

[0 -8 -4 | b+4b2]

The rank of A is 2 because there are two nonzero rows in the row echelon form. So, the system is consistent if and only if the rank of [A|B] is also 2, which means that the second row must not be a pivot row. This gives us the condition:

b + 4b2 ≠ 0

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Working together, Evan and Ellie can do the garden chores in 6 hours. it takes Evan twice as long as Ellie to do the work alone. Thus it takes Evan 18 hours to do the work alone.

Let x be the number of hours Ellie takes to do the garden chores alone. Then, Evan takes 2x hours to do the same work alone.

We can express their work rates as follows:
- Ellie's work rate: 1/x (jobs per hour)
- Evan's work rate: 1/(2x) (jobs per hour)

Now, we know that if they work together, they can do the garden chores in 6 hours. This means that their combined work rate is 1/6 of the job per hour.

When they work together, their work rates add up:
1/x + 1/(2x) = 1/6 (since they complete the work together in 6 hours)

Now, let's solve for x:
1/x + 1/(2x) = 1/6
To clear the fractions, multiply both sides by 6x:
We can solve for "x", which is Ellie's time to do the work alone:
1/6 = 3/2x
2x = 18
x = 9

So, Ellie takes 9 hours to complete the garden chores alone. Since Evan takes twice as long as Ellie, he takes 2 * 9 = 18 hours to complete the garden chores alone.

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It is about 1.657 times more probable to win a 6/48 lottery than a 6/52 lottery.

To find out how much more probable it is to win a 6/48 lottery than a 6/52 lottery, we need to compare their respective probabilities of winning.

The probability of winning a 6/48 lottery is given by the formula:

P(6/48) = C(6, 48) = 1/12271512

where C(6, 48) is the number of ways to choose 6 numbers out of 48.

Similarly, the probability of winning a 6/52 lottery is given by the formula:

P(6/52) = C(6, 52) = 1/20358520

where C(6, 52) is the number of ways to choose 6 numbers out of 52.

To find out how much more probable it is to win the 6/48 lottery than the 6/52 lottery, we can calculate their relative probabilities:

P(6/48) / P(6/52) = (1/12271512) / (1/20358520) ≈ 1.657

Therefore, it is about 1.657 times more probable to win a 6/48 lottery than a 6/52 lottery.

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If a random sample of individuals are polled in a phone survey and asked how happy they are with their life, selection bias would be introduced.

This is because the sample is limited to individuals who have access to phones and are willing to participate in the survey, which may not accurately represent the entire population. Additionally, the question itself may introduce response bias if it is worded in a way that encourages respondents to give a certain answer. The type of bias that would be introduced if a random sample of individuals are polled in a phone survey and asked how happy they are with their life is called "response bias." This occurs because individuals might not provide accurate answers due to factors like social desirability, personal preferences, or misinterpretation of the question, leading to a skewed representation of the true feelings of the population.

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Answer:4 1/4

Step-by-step explanation:

1 3/4 + 2 1/4 + 1/4= 4 1/4

The probability that the proportion of sampled teenagers who own a smartphone is between 0.45 and 0.55 is:

0.9564 - 0.2296 ≈ 0.7268

What is Probability ?

Probability is a measure of the likelihood or chance of an event occurring. It is expressed as a number between 0 and 1, where 0 represents impossibility (an event that can never occur) and 1

Part 1: The mean is calculated as:

mean = gp = 0.48

Part 2: The standard deviation is calculated as:

σ = √[(gp * (1 - gp))÷n]

where n is the sample size.

σ = √[(0.48 * 0.52)÷150]

σ ≈ 0.0408

Part 3: To find the probability that more than 50% of the sampled teenagers own a smartphone, we need to calculate the z-score and use a standard normal distribution table. The z-score is calculated as:

z = (x - gp)÷σ

where x is the proportion of teenagers owning smartphones. We want to find the probability that x is greater than 0.50. So,

z = (0.50 - 0.48)÷0.0408 ≈ 0.49

Using a standard normal distribution table, the probability corresponding to a z-score of 0.49 is approximately 0.3120.

Part 4: To find the probability that the proportion of sampled teenagers who own a smartphone is between 0.45 and 0.55, we need to standardize the range of values using the z-score formula:

z1 = (0.45 - 0.48)÷0.0408 ≈ -0.74

z2 = (0.55 - 0.48)÷0.0408 ≈ 1.71

Using a standard normal distribution table, the probability corresponding to a z-score of -0.74 is approximately 0.2296, and the probability corresponding to a z-score of 1.71 is approximately 0.9564.

Therefore, the probability that the proportion of sampled teenagers who own a smartphone is between 0.45 and 0.55 is:

0.9564 - 0.2296 ≈ 0.7268

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