You scored an 85 on a test. This corresponds to a z-score of 1.80. What percentage of the scores are better than yours?

The possible solutions are 8 hours and 9 hours.

The number of hours for lifeguarding is 8 hours.

The number of hours for clearing tables is 9 hours.

It shows a relationship between two numbers or two expressions.

There are commonly used four inequalities:

Less than = <

Greater than = >

Less than and equal = ≤

Greater than and equal = ≥

We have,

Two summer jobs:

Lifeguarding.

x = number of hours

= $19 per hour

Cleaning tables.

y = number of hours

=$14 per hour

Total hours in a week = 17 hours

Minimum earning = $280

The inequality represents the above situation.

x + y ≥ 17

19x + 14y ≥ 280

Solving for x and y.

x + y = 17 _____(1)

x = 17 - y

19x + 14y = 280 ______(2)

Putting (1) in (2) we get,

19(17 - y) + 14y = 280

323 - 19y + 14y = 280

323 - 5y = 280

323 - 280 = 5y

43 = 5y

y = 43/5

y = 8.6

y = 9

Now,

x = 17 - y

x = 17 - 8.6

x = 8.4

x = 8

Thus,

The possible solutions are 8 hours and 9 hours.

The number of hours for lifeguarding is 8 hours.

The number of hours for clearing tables is 9 hours.

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If (x + 3) is a factor of f(x) = x³ + kx + 3 , then the value of k is -8 .

In the question ,

it is given that ,

the function is f(x) = x³ + kx + 3 ,

and also given that (x+3) is a factor of f(x) , that means

x + 3 = 0

x = -3

x = -3 should satisfy the function ,

So , substituting x = -3 in the function f(x) = x³ + kx + 3,

we get

f(-3) = (-3)³ + k(-3) + 3 = 0

-27 -3k + 3 = 0

-3k - 24 = 0

-3k = 24

k = 24/(-3)

k = -8

Therefore , If (x + 3) is a factor of f(x) = x³ + kx + 3 , then the value of k is -8 .

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Answer:

48

Step-by-step explanation:

1/3+(1/2*2/3)+(1/4*1/3)=3/4

1-3/4=1/4

So 12 book were 1/4 of the shipment.

So 48 book sis total.

Answer:

Step-by-step explanation:

C

The average speed of the truck is 50 m/s .

We know that the average speed of any vehicle is calculated by total distance divide by total time.

Now the truck travels at 50 m/s for 30 seconds.

Distance covered in 30 seconds = 50 × 30 = 1500 meters

Time taken = 30 seconds

average speed = 1500 / 30 = 50 m/s

The average speed now accounts for the majority of the distance travelled. Average speed is essentially a method for calculating distance and the rate of transit time.

Knowing the average speed is crucial because it is clear that the pace will vary throughout the voyage. The average speed of a vehicle or an object can be determined using a variety of methods.

That is the most popular and simple way for figuring your average speed. It functions best when the object's speed remains constant throughout the journey, never rising or falling.

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Answer:

Domain: [0,∞), {x|x ≥ 0}

Range: [0,∞), {y|y ≥ 0}

Step-by-step explanation:

1. Find where the FUNCTION is DEFINED.

A function is a set of ordered pairs where each first element is paired with one, and only one, second element. No element in either pair is without a partner.

2. Find the DOMAIN: The set of all x-values that a function passes through. Also, it is the left coordinate in a coordinate pair.

3. The RANGE: the set of all y-values that a function passes through. Also, it is the right coordinate in a coordinate pair.

Answer:

Step-by-step explanation:

Hi, Julia,  they are trying to ask about error, or the confidence that there is not an error. It's kinda like saying,  we're 100% sure the answer is correct, mostly :DDDD   which really lowers your confidence about the 100% correct statement.   Anyway,  sooo then they give the way to show deviation,  from something.  if you've had Calculus one,  this is the same thing as the Delta , Epsilon thing, about a small distance away from the target is still with in a certain range.   I feel like if they had written the inequality like this...

( p' - E) < p < (p'+E)   it would be clearer about the inequality.  E is just a tiny distance away in the positive and negative direction.  E plays the role of epsilon.  the numbers they give are the range of the confidence. I don't think they ask a very clear question.  

0.056<p<0.112

p is kinda like our "best guess"  answer, and we're giving it this range that it's probably within,   for a certain level of confidence.   You can see, that as the confidence goes down,  that range can become bigger.  

Answer:20

Step-by-step explanation:

Answer: D. 81

Step-by-step explanation:

Box A: 3 possibilites

Box B: 3 possibilites

And so on, so you get 3^4, which is 81

The greatest width possible if the length of the rectangular lot is 25 ft longer than twice the width and if the perimeter of the lot cannot exceed 350 ft is 50 ft.

We are given,

The length of the rectangular lot is 25 ft longer than twice the width.

The perimeter of the lot cannot exceed 350 ft.

Let the width of the rectangular lot be x.

So, the length of the rectangular lot =  2x + 25

We know that the perimeter of the rectangle is given by:

P = 2(L + W)

Substitute the given values in the above formula;

350 = 2(2x +25 + x)

350 / 2 = 3x + 25

175 - 25 = 3x

x = 150 / 3

x = 50 ft

So, the width of the rectangular lot = 50 ft

And, the length of the rectangular lot = 2 * 50 + 25 = 125

Thus, the greatest width possible if the length of the rectangular lot is 25 ft longer than twice the width and if the perimeter of the lot cannot exceed 350 ft is 50 ft.

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Answer: AAS

Step-by-step explanation:

Because of the pair of vertical angles, there are two pairs of congruent angles and one pair of congruent sides. This means the triangles are congruent by AAS.

Answer:

{x,y}={25/7,41/7}

Step-by-step explanation:

Check the picture below.

Answer:

210

Step-by-step explanation:

200 × (5% + 1)

=200 × (0.05 + 1)

=200 × 1.05

=210

yan po hope it helps

Answer:

279

Step-by-step explanation:

According to the scale factor, When the scale is changed to 20 feet to 1 unit, then the drawing would be exactly the same shape, here only each side would have half the original drawing units.

Scale factor:

The ratio between the scale of a given original object and a new object, which is its representation but of a different size (bigger or smaller) is known as scale factor.

Given,

This is a scale drawing of an apartment. The actual apartment has a perimeter of 160 ft.

Here we need to find the reason for the scale drawing of the apartment using the scale 20 feet to 1 unit from the apartment

Here we know that the actual apartment has a perimeter of 160 ft.

And we have to draw another scale drawing of the apartment using the scale 20 feet to 1 unit from the apartment to the drawing.

So, as per the given details, the perimeter lies along the edges of squares and we count 16 sides of squares as we work around the perimeter, this means that each square is calculated as,

=> 160 / 16 = 10 feet on a side.

Therefore, 10 feet in real life plots to 1 unit on the drawing

Therefore, if we change the scale to 20 feet to  1 unit , then the drawing would be exactly the same shape, only each side would have half the original drawing units.

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Answer:

78

exclamation is that if 50 is lower than 60 which it is meaning that 78 is the correct answer if you multiply 18 + 34 that is not the right answer but there should be a right answer under this question you shouldn't trust me because I do not give a what the answer is I do not suggest you write down this answer but you do your top G

The maximum number of calling minutes you can use to keep your bill at $50 or lower is 110 minutes. If you use 110 minutes or less, your bill will not exceed $50.

To keep your bill at $50 or lower for the month, you need to set up an inequality using the cost function C(x):

C(x) = 40 + 0.20(x - 60)

Since you want to keep the cost at or below $50, the inequality is:

C(x) ≤ 50

Now, substitute the expression for C(x) into the inequality:

40 + 0.20(x - 60) ≤ 50

40 + 0.20x - 12 ≤ 50

0.20x + 28 ≤ 50

Now, isolate the term with "x" on one side by subtracting 28 from both sides:

0.20x ≤ 50 - 28

0.20x ≤ 22

Finally, divide both sides by 0.20 to solve for "x":

x ≤ 22 / 0.20

x ≤ 110

The maximum number of calling minutes you can use to keep your bill at $50 or lower is 110 minutes. If you use 110 minutes or less, your bill will not exceed $50.

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For the given equation,4x²−y²−24x−4y+28=0.The center is (h,k)=(3,−2), vertex (h+a,k)=(4,−2) and (h−a,k)=(2,−2), foci is (h+c,k)=(5.23,−2) and (h−c,k)=(0.77,−2)

An equation is a statement that two expressions, which include variables and/or numbers, are equal. In essence, equations are questions, and efforts to systematically find solutions to these questions have been the driving forces behind the creation of mathematics.

It is given that, the equation of the hyperbola is,

4x²−y²−24x−4y+28=0

Comparing the equation with the standard equation we get,

Center (h,k)=(3,−2)

Vertex (h+a,k)=(4,−2) and (h−a,k)=(2,−2)

Foci (h+c,k)=(5.23,−2) and (h−c,k)=(0.77,−2)

Asymptotes y=2x−8 and y=−2x+4

Thus, for the given equation,4x²−y²−24x−4y+28=0.The center is (h,k)=(3,−2), vertex (h+a,k)=(4,−2) and (h−a,k)=(2,−2), foci is (h+c,k)=(5.23,−2) and (h−c,k)=(0.77,−2)

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The player ran 60 yards on the football field

A football field measures a length of 100 yards, using subtraction the required dimensions are calculated

The player started form 20 yards line to 20 yard of the other end of the field

The player did not ran the initial 20 yards and the finial 20 yards

this added to give 40 yards

Length covered by the player

100 yards - 40 yards =  60 yards

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Using mathematical permutation, there 30240 number of 10-letter words that can be formed from the arrangement of letters cbqgvlbbgc

Permutation is simply the manner of arrangement or selection of elements.

We shall calculate for the permutation of the letters cbqgvlbbgc as follows:

There are total of 10 letters

c = 2

b = 3

g = 2

q = 1

v = 1 and,

l = 1

permutation of cbqgvlbbgc = 10!/(2! × 2! × 3!)

permutation of cbqgvlbbgc = (10 × 9 × 8 × 7 × 6 × 5 × 4 × 3!)/(2! × 2! × 3!)

dividing common factors of the numerator and denominator, we have

permutation of cbqgvlbbgc = 10 × 9 × 8 × 7 × 6 × 5

permutation of cbqgvlbbgc = 30240

Therefore by permutation, we derived 30240ways 10-letter words can be arranged from the letters cbqgvlbbgc.

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1.  Elijah is the smallest sibling among his brother who is 4 years older than her and Bryan is the eldest sibling who is twice as James, what is his age of James if the sum of their ages is 80 years?

2. If the equation in step B had been 2(x + 4) = 80,  the changed statement would be Bryan is 80 years old.

A numerical expression is a mathematical statement written in the form of numbers and unknown variables. We can form numerical expressions from statements.

Here we are converting a numerical expression into a statement.

Given,

Step A

Let x = Elijah’s age.

x + 4 = James’s age

2(x +4) = Bryan’s age.

Step B

x + x + 4 + 2(x +4) = 80.

Step C 4x + 12 = 80

X = 17

Step D James is 21.

The verbal problem to the algebra test can be stated as

Elijah is the smallest sibling among his brother who is 4 years older than her and Bryan is the eldest sibling who is twice as James, what is the age of James if the sum of their ages is 80 years?

If the equation in step B had been 2(x + 4) = 80,  the changed statement would be Bryan is 80 years old.

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Answer:

Step-by-step explanation:

hope this helps

Using the vertex of the quadratic equation, it is found that the profit will be maximized when each ticket price is sold for $2.

A quadratic equation is the second-order degree algebraic expression in a variable. the standard form of this expression is  ax² + bx + c = 0 where a. b are coefficients and x is the variable and c is a constant.

Considering the coefficient a, we have;

If a < 0, the vertex is a maximum point.

If a > 0, the vertex is a minimum point.

In this question, the function is modeled as follows, considering x as the price divided by $2.

P(x) = -15x² + 60x + 30.

The coefficients are a = -15 < 0, b = 60, c = 30, therefore the x-value of the vertex is given by:

V = -b/2a

V = -60/2(-15)

V = -60/-30

V = 2

Hence, the profit will be maximized when each ticket price is sold for $2.

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The term is tn=-3n+11

From the question, we have

The sequence is 8, 5, 2, –1, –4, ...

d = 5-8 = -3

t1 = 8

tn = t1+(n-1)d

tn=8+(n-1)(-3)

tn=8-3n+3

tn=-3n+11

Addition:

The phrase "the addition" refers to combining two or more numbers. Adding two numbers is indicated by the plus sign (+), therefore adding three is written as three plus three. Additionally, the number of times the plus symbol (+) is used is up to you. For example, 3 + 3 + 3 + 3. Mathematical addition is a crucial component of the learning curriculum for kids. In primary school, students learn simple addition sums such as one-digit facts,

Math addition sums, and double-digit Math addition sums. One of the most fundamental and interesting

Math concepts for elementary school children is addition sums. Math is a fascinating subject, and children first learn basic mathematical concepts like adding numbers in their early years.

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Answer:

You take a pencil and slowly go across the graph from left to right.  If any two points are under the pencil at any one time, the relations is not a function.  For a relations to be a function, every input must have only one output, so there will be no two points graphed vertically on top of each other.

Step-by-step explanation:

The equation of line in the given graph with coordinate points (2,-2) and (-3,-6) is 4x-5y=18.

A straight line's general equation is y = mx + c, where m is the gradient and y = c is the value at which the line intersects the y-axis. This value c is known as the y-axis intercept. Linear equations are classified into three types: point-slope, standard, and slope-intercept. The equation of a two-dimensional line is ax+by=c; it is fair to predict that the equation of a three-dimensional line is ax+by+cz=d; reasonable, but incorrect—it turns out that this is the equation of a plane. A plane, unlike a line, does not have a clear "direction."

Here,

The coordinates of line will be (2,-2) and (-3,-6).

slope m=(-6-(-2))/(-3-2)

=-4/-5

=4/5

(y-y1)=m(x-x1)

y+2=4/5(x-2)

5(y+2)=4(x-2)

5y+10=4x-8

4x-5y=18

4x-5y=18 is the equation of the line in the given graph with coordinate points (2,-2) and (-3,-6).

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A person race walking a distance of 20 kilometers in 100 minutes is more faster with a speed of 0.2 kilometer per minutes.

Mathematically, the speed of a physical object or body can be calculated by using this formula;

Speed = distance/time

Next, we would convert the unit of distance covered by the bird in miles to kilometers as follows:

1 mile = 1.60934 kilometer.

10,000 miles = X kilometer.

Cross-multiplying, we have:

X kilometer = 10,000 miles × 1.60934 kilometer.

X kilometer = 16,093.4 kilometer.

Also, we would convert the unit of time in days to minutes as follows:

1 day = 1,440 minutes

75 days = X minutes

Cross-multiplying, we have:

X minutes = 75 days × 1,440

X minutes = 108,000 minutes.

Now, we can calculate the speed of this bird as follows:

Speed = 16,093.4/108,000

Speed = 0.1490 kilometer per minutes.

For the speed of the person, we have:

Speed = 20/100

Speed = 0.2 kilometer per minutes.

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