Find f(-7) if f(x) = 2x + 8.

Answers

Answer 1
Sub in -7 for x to get 2(-7)+8 which is -14+8=-6.  f(-7)= -6

Related Questions

Debbie’s pizza shack cuts a large pizza into 10 equal slices. The diameter of the pizza is 16 inches. Bob eats two slices of pizza. How much pizza does he eat ?

Answers

Debbie’s pizza shack cuts a large pizza into 10 equal slices. The diameter of the pizza is 16 inches. Bob eats two slices of pizza. How much pizza does he eat ?

Solution:

There are 10 equal slices of pizza

Out of 10 slices bob eats 2 slices.

So, out of one pizza bob eats [tex] \frac{2}{10} [/tex] or [tex] \frac{1}{5} [/tex] th of the pizza


Calculating in terms of area,

Diameter of Pizza= 16 inches

So, Radius of Pizza= [tex] \frac{Diameter}{2} [/tex]

Radius of pizza=[tex] \frac{16}{2} [/tex]=8inches

Area of complete pizza= πr²=π8²=64π=200.96inches²

Area of the part had by Bob=[tex] \frac{1}{5} [/tex]*200.96 inches²

=40.192inches²

Bob had 40.192 inches² out of 200.96 inches² pizza


Which right triangular prism has the greatest volume?

Answers

the last one is the answer

Answer:

So Prism D has the greatest volume.

Step-by-step explanation:

Since volume of a triangular prism = A × h

where A = Area of base of prism

h = height

For prism (A) ⇒ Volume = ( 6 × 7 ) × 9

                                     = 42 × 9 = 378m³

Prism (B) ⇒ Volume = ( 5 × 6 ) × 13

                                 = 30 × 13 = 390m³

Prism (C) ⇒ Volume = ( 11 × 8 ) × 8

                                 = 88 × 8 = 704m³

Prism (D) ⇒ Volume = ( 10 × 8 ) × 9

                                 = 80 × 9 = 720m³

So prism D has the maximum volume.

1. a stockholder owns 381.881 shares. by the end of the year, he had increased his number of shares by 14.814. what is the total number of shares owned by the stockholder?
2. last week a sales representative earned a salary of $412.56 and a commission of $72.48. how much did she earn in all?
3.joan deposited a check for $48.51 in her checking account. if the previous balance was $381.49, how much money does joan now have in the account?

Answers

1 is 396.695
2 is 485.04
3 is 430
1. 367.067 is it......
 

What rate of simple interest is needed for $700 to double, in 3 years?

Answers

Final answer:

The rate of simple interest required for $700 to double in 3 years is found using the formula I=PRT. In this scenario, the rate comes out to be approximately 33.3%.

Explanation:

The subject of this question is finding the rate required for simple interest to cause an investment of $700 to double in a duration of 3 years.

Generally, we use the formula for simple interest: I=PRT where P is the principal amount (700 in this case), I is the interest earned, R is the rate we want to find and T is the time period in years.

However, since the aim is for the $700 to double, the interest earned will be an additional $700, thereby making the total $1400. Thus, substituting these values into the formula, we get 700 = 700 * R * 3. Simplifying this, we find that R = 700/(700*3) = 1/3 or approximately 33.3%.

Hence, the rate of simple interest required for $700 to double in 3 years is approximately 33.3%.

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R = 1/3 or 33.33%. So, the simple interest rate needed for $700 to double in 3 years is approximately 33.33%.

To find out the simple interest rate that is needed for $700 to double in 3 years, we can set up the equation based on the formula for simple interest, which is I = PRT (where I is the interest, P is the principal amount, R is the rate of interest, and T is the time period in years).

Since the student wants the money to double, the interest gained should be equal to the principal, which means I = $700. The time given is T = 3 years. Plugging these values into our formula, we get:

$700 = $700 × R  × 3

By dividing both sides by $2100 ($700  ×3), the equation simplifies to:

R = $700 / $2100

Therefore, R = 1/3 or 33.33%. So, the simple interest rate needed for $700 to double in 3 years is approximately 33.33%.

The area of the base of the regular quadrilateral pyramid is 36 cm2 and the area of a lateral face is 48 cm2. Find Lateral area of the pyramid

Answers

we know that
They are 4 Lateral sides on the regular quadrilateral pyramid,
so
 if one of them is 48 cm²,
we multiply it by 4,
48 cm²*4------> 192 cm²

the answer is
The Lateral area of the pyramid is 192 cm²

John ,Rick , and Molli are painting a room together. It takes all of them 16 hours to paint the room to perfection. It takes John 8 hours to paint the room alone , and it takes Rick 2 hours to paint the room alone. What is the hourly rate it take’s of john to paint the room alone?

Answers

John's hourly rate is 1/8 of the room per hour.
Rick's hourly rate is 1/2 of the room per hour.
Molli's hourly rate would be 3/8 of the room per hour.

It takes Molli 2 2/3 hours to paint the room alone.

Explanation
Since John paints the entire room (100%=1) in 8 hours, he would paint 1/8 of the room in 1 hour.
Since Rick paints the entire room (100%=1) in 2 hours, he would paint 1/2 of it in 2 hour.

We do not yet know Molli's rate, so we will call it x.

We know that 1/8+1/2+x = 1 hour.

We will use 8 as a common denominator:
1/8+4/8+8x/8 = 1

Adding the numerators, 
(1+4+8x)/8 = 1

Multiply both sides by 8:
1+4+8x = 8

Add like terms:
5+8x = 8

Subtract 5 from both sides:
5+8x-5=8-5
8x=3

Divide both sides by 8:
8x/8 = 3/8
x = 3/8

Molli's rate is 3/8.

Since she can paint 3/8 of the room in 1 hour, we can set up the equation
3/8x = 1

Divide both sides by 3/8:
3/8x ÷ 3/8 = 1 ÷ 3/8
x = 1/1 ÷ 3/8 = 1/1 × 8/3 = 8/3
x = 2 2/3

This is the amount of time it takes Molli to paint the entire room.

John's hourly rate of painting a room alone is 1/8 of the room per hour, which is calculated from the time he takes to complete the job on his own.

The question asks for the hourly rate at which John can paint a room alone. Knowing that John takes 8 hours to paint the room by himself, we can find his hourly rate by understanding the concept of work rates in combination tasks. Since painting can be considered a task that involves continuous work, the rate at which the room gets painted relates directly to a painter’s work rate, which is the fraction of the room they can paint per hour. For John, his work rate is the reciprocal of the time he takes to paint the room alone, which in this case is 1/8 of the room per hour.

Tell whether the study is an experimental study or an observational study.
You want to study the effects of regular exercise on a person’s heart rate. You measure the heart rate of a person at rest and again after jogging in place for 5 minutes. The control group is every other student who enters the room. The experimental group is those students who are not in the control group.

Answers

Final answer:

The study described is an experimental study. The independent variable is regular exercise and the dependent variable is the person's heart rate. The control group is the group of students who do not exercise, while the experimental group is the group of students who engage in regular exercise.

Explanation:

The study described is an experimental study.

In an experimental study, the researcher directly manipulates the independent variable to determine its effect on the dependent variable. In this case, the independent variable is regular exercise and the dependent variable is the person's heart rate.

The control group is the group of students who do not exercise, while the experimental group is the group of students who engage in regular exercise. By comparing the heart rates of the two groups before and after exercise, the researcher can determine the effects of exercise on heart rate.

What is the approximate volume of a cylinder with a radius of 8 cm and height of 5 cm?

A. 62.8

B. 251.2

C. 25.1

D. 502.4

E. 1004.8

Answers

V(cylinder)=πr² *h
r=8 cm
h=5 cm
V(cylinder)=πr² *h =3.14*8²*5= 1004.8 cm³
Answer : E.

What is the point-slope form of a line with slope -3 that contains the point (10, -1)?

A.y + 1 = 3(x - 10)
B.x + 1 = -3(y - 10)
C.y + 1 = -3(x - 10)
D.y + 1 = 3(x + 10)

Answers

When in point-slope form, the number next to the y and the x by themselves will be the opposite of what they would actually be as coordinates. This means that the y-coordinate, -1, will show up as y+1. This eliminates A and B out of the choices.

The slope is -3, which will be the number outside of the parentheses, which is what we see in C’s answer or -3(x-10).

Therefore, the answer is C: y+1 = -3(x-10).

Two angles are complementary. The measure of the largest angle is two times the measure of the smaller angle. What is the measure of the larger angle?
Please help! :D

Answers

An complementary angle = 90°

one of the angles is twice as large as the smaller one

let the larger angle be x, and the smaller = y

x = 2(y)
x + y = 90

Plug in 2y for x

2y + y = 90

simplify, combine like terms

2y + y = 90

3y = 90

isolate the y, divide 3 from both sides

3y/3 = 90/3

y = 90/3

y = 30

plug in 30 for y in the equation x + y = 90

x + (30) = 90

isolate the x, subtract 30 from both sides

x + 30 (-30) = 90 (-30)

x = 90 - 30

x = 60
°

The measurement of the larger angle is 60°

hope this helps

Find the volume of the cylinder in terms of pi. (h = 6 and r = 3)

Thank you!

Answers

the cylinder is not a right-circular cylinder, is rather a slanted cylinder, however, recall Cavalieri's Principle, if the cross-sections of the slanted cylinder are the same as the cross-sections of a right-cylinder at each height, then their volume is the same.

so the volume of this slanted cylinder is really the same volume as a right-circular one,

[tex]\bf \textit{volume of a right-circular cylinder}\\\\ V=\pi r^2 h~~ \begin{cases} r=radius\\ h=height\\ -----\\ r=3\\ h=6 \end{cases}\implies V=\pi (3)^2(6)\implies V=54\pi [/tex]

Joy and Cullen put some money into their money boxes every week. The amount of money (y), in dollars, in their money boxes after a certain amount of time (x), in weeks, is shown by the equations below:

Joy: y = 30x + 20
Cullen: y = 20x + 90

After how many weeks will Joy and Cullen have the same amount of money in their money boxes, and what is that amount?



6 weeks, $150
230 weeks, $7
7 weeks, $150
7 weeks, $230

Answers

The answer would be D. 7 weeks, $230. 

Explanation: y would be the total amount after x weeks. So, to find the answer, simply go through your choices and insert x and y. Both y's for Joy and Cullen have to match up for the answer to be correct. 

For answer D, it looks like: 

Joy: 30(7) + 20 = 230
Cullen: 20(7) + 90 = 230

A rock is projected directly upward from ground level with an initial velocity of 90 ft/sec. After how many seconds will it return to the ground?

Answers

For this case we have the following equation of motion:
 h (t) = -16t ^ 2 + 90t
 Equaling the equation to zero we have:
 -16t ^ 2 + 90t = 0
 We look for the roots of the polynomial:
 (t) (- 16t + 90) = 0
 t1 = 0 (initial position)
 t2 = 90/16 = 5.625 s (time it reaches the ground again)
 Answer:
 
it will return to the ground in:
 
t = 5.625 s

PLEASEEE HALPPPPPP >.<

two boats start at the same point and speed away along courses that form 110 degree angle. if one boat travels at 24 miles per hour and the other boat travels at 32 miles per hour. how far apart are the boats after 30 minutes?
A. 21 miles
B. 22 miles
C. 23 miles
D. 24 miles
E. 25 miles

Answers

A. 21 miles

You divide 2 into 32 and get 16, then you add 16 plus 14 subtract 9 and get 21

The distance between the boats after 30 minutes is approximately 23.04 miles. Option C

How to find the distance between the two boats after 30 minutes

To find the distance between the two boats after 30 minutes, use the law of cosines. Let's denote the distance between the boats as "d".

We know that one boat is traveling at 24 miles per hour, and the other boat is traveling at 32 miles per hour. In 30 minutes (or 0.5 hours), the first boat would have traveled 24 * 0.5 = 12 miles, and the second boat would have traveled 32 * 0.5 = 16 miles.

Now, applying the law of cosines:

[tex]d^2 = (12)^2 + (16)^2 - 2 * 12 * 16 * cos(110^o)[/tex]

Calculating the equation:

[tex]d^2 = 144 + 256 - 384 * cos(110^o)[/tex]

Now,  evaluate cos(110°):

cos(110°) ≈ -0.34202

Substituting the value:

[tex]d^2[/tex] = 144 + 256 - 384 * (-0.34202)

[tex]d^2[/tex] =  144 + 256 + 131.23808

[tex]d^2[/tex] ≈ 531.23808

Taking the square root:

d ≈ 23.04

Therefore, the distance between the boats after 30 minutes is approximately 23.04 miles.

Rounded to the nearest whole number, the answer would be 23 miles (Option C).

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If AB=7 and AO=17.4 what is the length of the radius?

Answers

Using Pythagoras Theorm,
(AO)² = (AB)²+(OB)²
(17.4)²=(7)²+ r²
Therefore, Radius = 15.92 cm Approximately.
The angle the radius makes with AB is a right angle, so the Pythagorean theorem applies.
  r² = 17.4² - 7² = 253.76
  r = √253.76 ≈ 15.9

Write a report to the president of the company explaining the solutions.

Answers

The value of x ranges above -10 and is within the values of 25 or lesser.

Answer:

The negative part of the solution set is ignored, because you cannot produce a negative number of phones.

The company has at least an 80% success rate if the next 25 or more phones that are assembled work.

Because the company has already made 10 phones and 7 are not working, if the next 25 phones work, the 35th phone puts the company at its goal of 80% or more.

Step-by-step explanation:

If it’s the weekend, the chances of Allison going to the store is 4/5. If its a weekday, the chances are 2/5. Given that Allison will not go to the store, what is the probability that it’s the weekend?

Answers

Given that it's a weekend, chances of Allison going to the store is 4/5
If its a weekday, the chances are 2/5.
Given that Allison will not go to the store the probability that it’s the weekend? will be:
1-(it's a weekend and Allison will go to the store)
=1-4/5
=1/5

Answer: 1/5

Use the given information to find the amount aa in the account earning compound interest after 6 years when the principal is $3500. r=2.16%r=2.16%, compounded quarterly the amount after 6 years is $ .

Answers

$3,982.92

Equation for compound interest:
A = P (1+r/n)^nt

P = 3500
r = .0216
n = 4
t = 6

Answer: $3,982.92

Step-by-step explanation:

$3,982.92

Equation for compound interest:

A = P (1+r/n)^nt

P = 3500

r = .0216

n = 4

t = 6

One competitor in a 100-mile bicycle race took a total of 5 hours to complete the course. his average speed in the morning was 23 miles per hour. his average speed in the afternoon was 13 miles per hour. how many hours did he ride in the morning, and how many hours did he ride in the afternoon?

Answers

Let x = morning ride time, y = afternoon ride time.

We set up two different equations to represent the given info in the description. The first one is morning time + afternoon time = total time to complete the course. So it's x + y = 5. Next, we do morning average multiplied by morning ride time + afternoon average multiplied by afternoon ride time = total distance. So it's 23x + 13y = 100. Then, set up a system of equations:

x + y = 5
23x + 13y = 100

Now, we must pick which variable we want to solve for first. This way we can plug the number we solve for back into one of the original equations to find the other missing variable. I'm going to solve for x first so we multiply by the first equation by - 13. You'll see why in a bit. 

- 13(x + y = 5) >> - 13x - 13y = - 65

Your new system of equations is:

- 13x - 13y = - 65
23x + 13y = 100

Now we combine like terms amongst the two equations. Notice the y-variables will cancel each other out, leaving us with just the x to solve for like I want. 

10x = 35

Divide by 10 on both sides to isolate variable x

x = 35/10 or 3.5

Now that we have x, we solve for y. Plug your x-value back into either equation; I choose the first because it's easiest. 

3.5 + y = 5

Subtract 3.5 from both sides to isolate variable y.

3.5 + y - 3.5 = 5 - 3.5
y + 0 = 1.5
y = 1.5

So the competitor rode 3.5 hours in the morning and 1.5 hours in the afternoon. 

OR

The competitor rode 3 hours, 30 minutes in the morning and 1 hour, 30 minutes in the afternoon. 

. A circular window has a diameter of 40 centimeters. What is the circumference of the window? Use 3.14 for π π 251.2 cm

Answers

The circumference of the window is 125.6 cm.

write the equations for the basic absolute value equation y=|x-h|+k under the given transformations:

1. shift 1 unit to the right and up 2 units

2. shift 3 units to the left and 7 units down

3. vertical shrink by a factor of 1/3

4. vertical stretch by a factor of 3

Answers

Left & Right affect the h,
Up & Down affect the k,
Shrink & Stretch affect the "a" (which is in front of the absolute value expression).

1. shift 1 unit to the right and up 2 units → y = |x-1| + 2
2. shift 3 units to the left and 7 units down → y = |x + 7| - 7
3. vertical shrink by a factor of 1/3 → y = [tex] \frac{1}{3} [/tex]|x|
4. vertical stretch by a factor of 3 → y = 3 |x|

Please help me.......

Answers

what grade are you in?

One quadratic function has the formula h(x) = -x 2 + 4x - 2. Another quadratic function, g(x), has the graph shown below

Which option below best describes the maximums of these two functions?

Functions g and h have the same maximum of -2.
Functions g and h have the same maximum of 2.
Function h has the greater maximum of -2.
Function g has the greater maximum of 2.

Answers

We are comparing maxima.  From the graph we know that the max of one graph is +2 at  x = -2.  What about the other graph?  Need to find the vertex to find the max.

Complete the square of h(x) = -x^2 + 4x - 2:

h(x) = -x^2 + 4x - 2 = -(x^2 - 4x) -2
= -(x^2 - 4x + 4 - 4) - 2
=-(x^2 - 4x + 4)       -2+4
= -(x-2)^2 + 2            The equation describing this parabola is y=-(x-2)^2 + 2, from which we know that the maximum value is 2, reached when x = 2.

The 2 graphs have the same max, one at x = -2 and one at x = + 2.

Answer:

Functions g and h have the same maximum of 2.

Step-by-step explanation:

Determine the magnitude and the ordered pair that represents the vector from (18,3) to (-4,16)

Answers

let's get the component form, that'd be 

(18,3), (-4,16), component form => (-4-18 , 16-3), => (-22 , 13)

[tex]\bf ||\ \textless \ -22,13\ \textgreater \ ||\implies \sqrt{(-22)^2+(13)^2}\implies \sqrt{497}[/tex]

Answer:

The answer is B.

Step-by-step explanation:

(-22,13); magnitude=25.6

I am taking the cumulative review.

Brendan has 33 coins in his pocket, all of which are dimes and quarters. if the total value of his change is 615 cents, how many dimes and how many quarters does he have?

Answers

If all were dimes, the value would be $3.30. Brendan has $2.85 more than that. Each quarter that replaces a dime increases the value by $0.15, so Brendan must have $2.85/$0.15 = 19 quarters.

Brendan has 14 dimes and 19 quarters.

Jack rolls 6 sided number cube labeled 1-6 twice. to the nearest hundredth, what is the probability that the first roll is 4 and the second roll is an even number

Answers

The probability is 0.08.

The probability that the first roll is a 4 is 1/6, since there is one 4 out of six total possibilities.
The probability that the second roll is an even number is 3/6, since there are 3 even numbers out of 6 possibilities.

Together, we have 1/6(3/6) = 3/36 = 0.08

[tex] |\Omega|=6^2=36\\
|A|=1\cdot3=3\\\\
P(A)=\dfrac{3}{36}=\dfrac{1}{12}\approx8.3\% [/tex]

If a section of a line graph falls to the right, what does that indicate?

an increase
a decrease
no change
a mistake in the graph

Answers

It Would Be A Decrease Fam

This would be a decrease because the y value gets smaller as the x value gets larger.

2. Draw a right triangle with side lengths of 3, 4, and 5 units.

Answers

see the attached picture:

Answer:

My options for triangles

A certain arithmetic sequence has the following explicit formula for the nth term: an = 3 + (n - 1)(8) The same sequence has the following recursive formula: an = an-1 + _____ What number belongs in the blank space in the recursive formula? A. 5 B. 3 C. 8 D. 24

Answers

From the explicit formula:
an=3+(n-1)8
simplifying this we get:
an=3+8n-8
an=8n-5
thus 
the recursive formula is:
an=an-1+
the missing part is the common difference which is 8

The spheres radius is 1/3 the radius of the hemisphere how does the volume of the hemisphere compare with the volume of the sphere

Answers

Let the radius of the hemisphere be x, the radius of the sphere is 1/3x
the volume of the sphere will be:
V=4/3πr³
V=4/3×π×(1/3x)³
V=4/81πx³

Volume of the hemisphere will ve:
V=1/2×4/3πr³
v=2/3×π×x³
v=2/3πx³
comparing the two volume by dividing the the volume of the hemisphere by that of the sphere we obtain:
(2/3πx³)/(4/81πx³)
=13.5
this implies that the volume of the hemisphere is 13.5 times the volume of the sphere.

Answer:

It is greater than the volume of the sphere

Step-by-step explanation:

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