Nathan loved learning about earthquakes in science class. He told his brother that up until a 7.8-magnitude earthquake hit Nepal in 2015, Mount Everest had been moving northeast at a rate of 7.7×10

6 centimeters per minute. What would be the most appropriate unit for Nathan to use instead of centimeters per minute?

Answers

Answer 1

The most appropriate unit for Nathan to use instead of centimeters per minute is centimeters per year.

What is an earthquake?

An earthquake simply means a rapid motion of the solid layer of the Earth.

In this case, Nathan told his brother that up until a 7.8-magnitude earthquake hit Nepal in 2015, Mount Everest had been moving northeast at a rate of 7.7×10^-6 centimeters per minute.

Since the year is being discussed, the unit should be based on the year.

Learn more about earthquake on:

brainly.com/question/248561

#SPJ1


Related Questions

solve the equations and verify the answer ​

Answers

Answer:

See below

Step-by-step explanation:

I THINK what you wrote is:

2(x-2) - 3(x-3) = (5x-5) - 4(x-8)

2x -4   -3x+9  = 5x-5   -4x+ 32

2x-3x-5x+4x = 4 -9 -5 +32

-2x = 22     *** EDITED ***

x =  - 11  

Your friend has a coln that is not fair. It comes up heads 70% of the time and talls 30% of the time. You flip it twice. Let Xbe the number of heads that come up. Find the probability distribution for X

Answers

Let X be the number of heads that come up

[tex]\begin{gathered} \text{Probability of head = 70\% = }\frac{70}{100} \\ \text{Probability of tail = 30\% = }\frac{30}{100} \end{gathered}[/tex]

Step 1: Write out the formula for the binomial probability distribution

[tex]P_x=^nC_xp^xq^{n-x}[/tex][tex]undefined[/tex]

Don buys a shirt for $24.85. His friend Daryl spends $3.15 more for his shirt. Sean paid the same price as Daryl for his shirt but bought 2. How much did Sean spend for his 2 shirts?

Answers

Solution

- Don buys a shirt for $24.85.

- Daryl spends $3.15 more for his shirt. This means that Daryl spends

[tex]\$24.85+\$3.15=\$28[/tex]

- Thus, Daryl spends $28 on his shirt.

- Sean paid the same price as Daryl, that is, he paid $28 for each shirt.

- Sean bought two shirts, thus, Sean spends:

[tex]\$28+\$28=\$56[/tex]

Final Answer

Sean spends $56 on his 2 shirts

The data represents the number of cars that the sales staff at Templeton Motors sold this week.
4, 7, 6, 8, 3, 5, 4, 3, 4, 5, 2, 3
Which line plot correctly displays the data?
OA.
Formula Sheet
3.
Number of Cars Sold
X X
X X X
X X X X X X
+++
AHH
+
0 1 2 3 4 5 6 7 8 9 10
X
Number of Cars Sold
X X X X X X X
H
0 1 2 3 4 5 6 7 8 9 10
OC.
OD.

Number of Cars Sold
X X
X X X
X X X X X X X
++
0 1 2 3 4 5 6 7 8 9 10
X X
Number of Cars Sold
X X
X X X
H11
0 1 2 3 4 5 6 7 8 9 10

Answers

The line plot that correctly displays the data set, 4, 7, 6, 8, 3, 5, 4, 3, 4, 5, 2, 3, is: A.

How to Represent a Data on a Line Plot?

A line plot is a graphical representation of a data whereby the frequency of each data point is represented by a dot on the line plot.

The dots on each data point on the line plot corresponds to the frequency of a data point in a data distribution.

Given the data set, 4, 7, 6, 8, 3, 5, 4, 3, 4, 5, 2, 3, the frequency for each data point is:

2 - 1 dot

3 - 3 dots

4 - 3 dots

5 - 2 dots

6 - 1 dot

7 - 1 dot

8 - 1 dots

Thus, the line plot that correctly represents these data points alongside their frequencies is: A.

Learn more about line plot on:

https://brainly.com/question/27246403

#SPJ1

HELP PLSSSSSSSSSSSSSS

Answers

Answer: 64

Step-by-step explanation:

Length x width x higth= volume

4 x 8 x 2 = 64

Answer:

4 cm

Step-by-step explanation:

First, find the volume of the rectangular prism.
4*8*2=32*2=64 cm^-3

Now, the formula for the volume of the cube is:
Volume = side ^ 3
We know the volume is 64 cm^3, so plug it in to the equation:

64 = side ^ 3
take the cube root of both sides
4 = side

HELP ASAP WILL GIVE BRAINLEST
How many times larger is (1.064 x 10^1) than (7 x 10^−1)?

0.152
15.2
6.58
7.448

Answers

1.064 x 10¹ is 15.2 times larger than the 7 x 10⁻¹. It is obtaining the taking ratio of the given number. Option B is correct.

What is an arithmetic operation?

It is defined as the operation in which we do the addition of numbers, subtraction, multiplication, and division. It has basic four operators that are +, -, ×, and ÷.

We'll apply division by splitting into equal halves or groups, the division may be used to decide how to distribute a dish of cookies evenly among a group.

Let 7 x 10⁻¹ be x times the number 1.064 x 10¹.

The value of x  is obtained by taking the ratio of  1.064 x 10¹ and 7 x 10⁻¹.

x = 1.064 x 10¹ / 7 x 10⁻¹

x = 15.2

Thus,1.064 x 10¹ is 15.2 times larger than the 7 x 10⁻¹. It is obtaining the taking ratio of the given number. Option B is correct.

Learn more about the arithmetic operation here:

brainly.com/question/20595275

#SPJ1

A= hlba)10. The volume of a large can of tuna fish can be calculated using the formula V = ar?h.Write an equation to find the radius, r, in terms of V and h. Determine the diameter, tothe nearest inch, of a large can of tuna fish that has a volume of 66 cubic inches and aheight of 3.3 inches.

Answers

Given the formula for volume:

[tex]V\text{ = }\pi r^2h[/tex]

Let's rewrite the formula in terms r, V and h.

i) Rewriting for r in terms of V and h :

[tex]\begin{gathered} V\text{ = }\pi r^2h \\ \frac{V}{h}=\pi r^2 \\ \\ \sqrt[]{\frac{V}{\pi h}}=r \\ \\ r\text{ = }\sqrt[]{\frac{V}{\pi h}} \end{gathered}[/tex]

2) Given:

Volume, V = 66 cubic inches

height, h = 3.3 inches

We know that diameter is radius multiplied by 2.

To find the diameter, first find the radius.

Therefore, we have:

[tex]\begin{gathered} r\text{ = }\sqrt[]{\frac{V}{\pi h}} \\ \\ r\text{ = }\sqrt[]{\frac{66}{3.3\pi}} \\ \\ r\text{ = }2.52\text{ inches} \end{gathered}[/tex]

Since the radius is 2.52 inches, the dia,eter will be:

D = r x 2 = 2.52 x 2 = 5.04 inches

To the nearest inch = 5 inches

ANSWER:

diameter = 5 inches

The difference of seven times a number and five is one hundred find the number

Answers

Let the number be x

seven times the number = 7x

The difference of seven times a number and five is one hundred. It means that

7x - 5 = 100

7x = 100 + 5

7x = 105

x = 105/7

x = 15

The number is 15

A shopper pushes a grocery cart with a force F of 50 N downward and to the right, as shown in the figure below. The anglethe handle makes with the horizontal is 37°, and the cart is moved 14 m. Find the work W done, in joules (1).Ed

Answers

Solution

For this case we can create the following plot:

We want to find the work so we can use this formula:

[tex]W=Fd\cos \theta[/tex]

Replacing we got:

[tex]W=50\cdot14m\cdot\cos 37=559.04J[/tex]

Use the sketch tool to mark the picture with the given information. Then choose what postulate proves the triangles congruent.

Answers

We choose ASA Postulate to prove this triangle congruent.

In the given question given that

[tex]\overline{AC}[/tex] bisects [tex]\angle BAD[/tex].

[tex]\overline{AC}[/tex] bisects [tex]\angle BCD[/tex].

Since, [tex]\overline{AC}[/tex] bisects [tex]\angle BAD[/tex].

So [tex]m\angle BAC\cong m\angle DAC[/tex]

Since, [tex]\overline{AC}[/tex] bisects [tex]\angle BCD[/tex].

So [tex]m\angle BCA\cong m\angle DCA[/tex]

Then [tex]AC\cong AC[/tex]

Then [tex]\triangle BAC\cong \triangle DAC[/tex]

There given postulate are AAS, ASA, SSS, SAS.

We have proved using the ASA postulate.

Now describing the ASA postulate.

ASA means Angle-Side-Angle Postulate.

According to ASA Postulate, two triangles are congruent if two angles and the included side of one triangle are congruent with two angles and the included side of another triangle.

Hence, we choose ASA Postulate to prove this triangle congruent.

To learn more about Postulate link is here

https://brainly.com/question/11034038

#SPJ1

X Consider lines L and M on the graph below. Which of the following BEST describes the slope of these two lines? y L М. 10 9 8 7 6 5 3 2 1 X 0 1 2 3 4 5 6 7 8 9 10 L has a greater slope than M. Land M have the same slope. M has a greater slope than L.

Answers

since they are parellel lines, we conclude that they have the same slope, the second option is the correct one.

If Y (-7, -4) and Z (5, 2), find the slope of a line perpendicular to YZ

Answers

Answer:

slope of perpendicular line = - 2

Step-by-step explanation:

calculate the slope of YZ using the slope formula

m = [tex]\frac{y_{2}-y_{1} }{x_{2}-x_{1} }[/tex]

with (x₁, y₁ ) = Y (- 7, - 4 ) and (x₂, y₂ ) = Z (5, 2 )

[tex]m_{YZ}[/tex] = [tex]\frac{2-(-4)}{5-(-7)}[/tex] = [tex]\frac{2+4}{5+7}[/tex] = [tex]\frac{6}{12}[/tex] = [tex]\frac{1}{2}[/tex]

given a line with slope m then the slope of a line perpendicular to it is

[tex]m_{perpendicular}[/tex] = - [tex]\frac{1}{m}[/tex] = - [tex]\frac{1}{\frac{1}{2} }[/tex] = - 2

razy GolfmathsdivThe current value of a baseball card is 60 times its original value v (in dollars). The baseball card is worth$15. Write and solve an equation to find the original value of the baseball card.Equation:= 15Original value: $

Answers

Answer:

Equation: 60v = 15

Original value: $0.25.

Step-by-step explanation:

Current value: $15

Original value: v

The current value is 60 times the original value.

So, the equation is:

Equation: 60v = 15

Now we solve the equation to find the original value.

60v = 15

v = 15/60

v = 0.25

Original value: $0.25.

HELP ASAP

Solve z3 = 27.


z = 9

z = −9

z = 3

z = ±3

Answers

If z3=27
Z*3=27
Z=27/3
Z=+9

Answer:

the answer is 3

Step-by-step explanation:

Which graph represents the solution set of the system of inequalities-2x+y<_4 y>x+2

Answers

The graph of the solution set of the system of inequalities y > x + 2 and

- 2x + y ≤ 4 is shown in figure.

What is mean by Inequality?

A relation by which we can compare two or more mathematical expression is called an inequality.

Given that;

The inequalities is,

⇒ y > x + 2

And, - 2x + y ≤ 4

Now,

The inequality is,

⇒ - 2x + y ≤ 4

Add 2x both side, we get;

⇒ - 2x + y + 2x ≤ 4 + 2x

⇒ y ≤ 2x + 4

And, The second inequality is;

⇒ y > x + 2

So, Plot the graph of the inequalities  y ≤ 2x + 4 and y > x + 2.

We get the solution set of the system of inequalities.

Which is shown in figure.

Thus, The graph of the solution set of the system of inequalities y > x + 2 and - 2x + y ≤ 4 is shown in figure.

Learn more about the inequality visit:

https://brainly.com/question/13763238

#SPJ1

Mrs. Smith wants to buy floor covering for her master bedroom. The dimensions of the master bedroom are 11yd by 7yd. The floor covering is sold in square meters. How many square meters of floor covering will she​ need?

She will need ____ square meters.

Round answer to the nearest hundredth as needed.

Answers

Mrs. Smith will need 64m² of floor covering for her master bedroom.

The length L of the bedroom is 11 yards,

The breadth B of the bedroom is 7 yards.

The floor covering is available only in square meters.

As we know,

One yard = 0.9144 meters.

the length of the bedroom in meter is,

Length L = 0.091144 x 11

Length L = 10.02 meters.

the breadth of the bedroom in meters is,

Breadth B = 0.91144 x 7

Breadth = 6.38 meters.

the Area of Rectangular master bedroom in Meter square is,

Area = Length x Breadth

Area of the bedroom = 10.02 x 6.38

Area of the bedroom = 63.92 m²

Area of floor covering required = Area of the master bedroom.

Area of the floor covering required = 63.92 m².

Rounding off to nearest hundredth = 64m²

Mrs. Smith will need 64m² of floor covering.

To know more about area of rectangle, visit,

https://brainly.com/question/25292087

#SPJ1

Trevor's bonus last year with $6720 and this was 12% of his base salary. what is his base salary?

Answers

Answer:

$56,000.

Explanation:

Let his base salary = s

12% of his base salary = $6720

Thus, we have:

[tex]12\%\text{ of s=6720}[/tex]

Next, solve for s:

[tex]\begin{gathered} \frac{12}{100}\times s=6720 \\ 12s=6720\times100 \\ s=\frac{6720\times100}{12} \\ s=56,000 \end{gathered}[/tex]

His base salary is $56,000.

write down in terms of n, an expression for the nth term of the following sequences
-7,-12,-17,-22,-27

Answers

The expression for the nth term of the sequence -7, -12, -17, -22, -27... is -5n-2

The sequence is -7, -12, -17, -22, -27...

The first term = -7

The common difference  = The second term - The first term

= -12 - (-7)

= -12+7

= -5

The nth term of the sequence = a+(n-1)d

Where a is the first term

d is the common difference

n is the n terms

Substitute the values in the equation

The nth term of the sequence = -7+(n-1)-5

= -7-5n+5

= -5n-2

Hence, the expression for the nth term of the sequence -7, -12, -17, -22, -27... is -5n-2

Learn more about nth term of the sequence here

brainly.com/question/1582366

#SPJ1

How much hectares is 61,230 km²

Answers

Answer:

6 hecters in the khlathmandu

a cylinder had a radius of 3 and height of 2 need answer quick

Answers

To find the volume of a cylinder with radius 3 and height 3

we will use the formular below:

[tex]V=\pi r^2h[/tex]

where r is the radius and h is the height

From the question, r=3 and h = 2

substitute the value into the formula

[tex]V=\pi(3)^2\times2[/tex][tex]V=18\pi[/tex]

If we substitute the value of pie = 22/7

Then,

[tex]V=18\times\frac{22}{7}[/tex][tex]V\approx56.57\text{ cubic unit}[/tex]

The country of Latveria has a population of 11.2 million at the start of 1988, which grows at 4.4% per year.A) Write a recursive equation for the population of Latveria.B) Write an explicit equation for the population of Latveria.C) To the nearest tenth of a million, what is the population of Latveria at the start of 1994.

Answers

A) The recursive formula takes into account the previous term. For each term, the next term is expressed in respect to it

Looking at the given scenario, the popularion is increasing by 4.4%. This means that the common ratio is

1 + 4.4/100 = 1.044

Given that the initial population is 11200000, the recaursive formula or equation would be

[tex]\begin{gathered} f_n=\text{ 1.044}f_{n\text{ - 1}} \\ \text{where f}_1=\text{ 11200000} \end{gathered}[/tex]

B) For the explicit formula, the general formula for a geometric sequence is

an = a1 * r^(n - 1)

a1 = first term = 11200000

r = common ratio = 1.044

The explicit equation would be

an = 11200000 * 1.044^(n - 1)

C) At the start of 1994, the number of terms, n = 7

We would find a7 by substituting n = 7 into the explicit equation. We have

a7 = 11200000 * 1.044^(7 - 1)

a7 = 11200000 * 1.044^6 = 14501770

How do you do this step by step?

-7 + 9 + (-8)

Answers

Step-by-step explanation:

-7 + 9 + (-8)

2 + (-8)

-6

Hope this helps! :)

Step-by-step explanation: Remove parenthesis. If there is a "+" in front of an expression in parenthesis, the expression remains the same.

-7+9-8. Calculate the sum or difference. You should get -6.

The variables x and y vary directly. Write an equation that relates the variable. Then find x when y=16.

Answers

7) We know that x = 5 and y = 2

We can write an equation that relates this values as a proportion.

Let's say there is a number r such as:

x*r=y

That's a equation that relates x and y. Let's solve for the values given.

[tex]5\cdot r=2[/tex]

Now solve for r:

[tex]r=\frac{2}{5}[/tex]

The relation we found is:

[tex]x\cdot\frac{2}{5}=y[/tex]

Now to find the value of x when y = -6, we replace it in the equation:

[tex]\begin{gathered} x\cdot\frac{2}{5}=-6 \\ x=-6\cdot\frac{5}{2}=-15 \end{gathered}[/tex]

Then with this relation, x = -15 when y = -6

(04.01 LC)The graph shows a system of equations:y = x + 433y = -2x + 2-3-4-5What is the solution to the system of equations?0 1-2, 2)(2, 2)(2,-2)O(-2,-2)

Answers

Explanation:

We have two equation of line. Both lines intersect at a point.

The point of intersection of two graphs, is the solution of the graph.

At this point, both will have same x and y values

Tracing the graph:

The point of intersection occurs at x = -2, y = 2

Hence, the solution is at (-2, 2)

a1 = 1; d = 3a1 = 1; d = −3a1 = 17; d = 3a1 = 17; d = −3

Answers

Given:

A graph is given and the points on the graph are as:

(1, 17), (2, 14), (3, 11), (4, 8), (5, 5), (6, 2)

Required:

To determine the value of

[tex]a_1[/tex]

and d for the given sequence.

Explanation:

We can observe from the graph that the given sequence is an arithmetic sequence.

Here

[tex]a_1[/tex]

represent the first value and d represent the common ratio.

So the values are as:

[tex]\begin{gathered} a_1=1 \\ d=14-17=\text{ -3} \end{gathered}[/tex]

Final Answer:

[tex]a_{1=1},\text{ d = -3}[/tex]

The second option is the correct answer.

Write the following sentence using mathematical symbols:
n is greater than or equal to 0.

Answers

The sentence using mathematical symbols would form an inequality as; n ≥ 0.

What is inequality?

Inequality is defined as the relation which makes a non-equal comparison between two given functions. If the equation or inequality contains variable terms, then there might be some values of those variables for which that equation or inequality might be true. Such values are called solutions to that equation or inequality. The Set of such values is; called the solution set to the considered equation or inequality.

We need to write a sentence using mathematical symbols:

Given that "n is greater than or equal to 0"

The inequality form as;

n ≥ 0

Therefore, the sentence using mathematical symbols would form an inequality as; n ≥ 0.

Learn more about inequalities here:

https://brainly.com/question/27425770

#SPJ1

Please solve for x using steps 1/3x= 1/3+6/x

Answers

You have the following algebraic equation:

1/3x = 1/3 + 6/x

In order to solve the previous equation you first multiply both sides of the equation by x, thus, you can quit x denominators in the equation. Proceed as follow:

1/3x = 1/3 + 6/x multiply by x both sides

1/3 = x/3 + 6 multiply by 3 both sides

1 = x + 18 subtract 18 both sides

1 - 18 = x + 18 - 18

-17 = x

-17 = x is the same as x = -17. The solution to the given equation is x = -17.

Write the equation for the graph below.Tomato Prices108Price (In dollars)01 2 3 4 5 6 7 8 9 10Weight(in pounds)

Answers

The form of the linear equation is

y = m x + b

m is the slope of the line

b is the y-intercept

The rule of the slope is

[tex]m=\frac{y2-y1}{x2-x1}[/tex]

(x1, y1) and (x2, y2) are two points on the line

Since (0,0) and (10, 12) are two points on the line

x1 = 0 and y1 = 0

x2 = 10 and y2 = 12

Now substitute them in the rule to find m

[tex]m=\frac{12-0}{10-0}=\frac{12}{10}=1.2[/tex]

The slope of the line is 1.2

Substitute it in the form of the equation

y = 1.2 x + b

b is the y-intercept which means value y at x = 0

Since at x = 0, y = 0

Then b = 0

The equation of the line is

y = 1.2 x

How much grain can a farmer hold in this silo? Use π = 3.14.A. 2,093.3 ft³B. 11,513.3 ft³C. 9,420 ft³D. 12,560.2 ft³

Answers

To find out how much grain the farmer can hold we need to find the volume of the silo. The silo is made from a circular cylinder and half a sphere.

The volume of the cylinder is given by:

[tex]V=\pi r^2h[/tex]

In this case r=10 and h=30, plugging this values in the equation above we have that the volume of the cylinder is:

[tex]\begin{gathered} V=(3.14)(10)^2(30) \\ V=9420 \end{gathered}[/tex]

Hence the volume of the cylinder is 9420 cubic feet.

Now we need to find the volume ot half the sphere, the volume og an sphere is given by:

[tex]V=\frac{4}{3}\pi r^3[/tex]

Plugging the radius we have that:

[tex]\begin{gathered} V=\frac{4}{3}(3.14)(10)^3 \\ V=4186.6 \end{gathered}[/tex]

Now, we only need half this volume then the volume of the top of the silo is:

[tex]V=2093.3[/tex]

Finally we add the volume of the cylinder and half the sphere, therefore the volume of the sylo is:

[tex]11513.3[/tex]

and the answer is B.

Jose invests $8,216 in a savings account with a fixed annual interest rate of 7% compounded 12 times per year. What will the account balance be after 11 years?

Answers

After 11 years, the account balance is $17,704.987. (approx.)

Compound interest is defined.

The principle of the first loan is multiplied by the annual interest rate multiplied by the number of compound periods minus one to calculate compound interest.

The principal of the loan plus compound interest will then be what is left.

Given,

P = $8,216 for the principal value.

Interest rate, r = 7% or 0.07.

Period, with t = 11.

Interest applied n times every time period, or 12 times.

As far as we are aware, A = P(1 + r/n) n*t

where A is the whole sum.

Fill out the formula with the values,

=> A = 8216(1 + 0.07/12) ^ 11*12

= 8216((12 + 0.07)/12) ^ 132

Upon calculation, we obtain,

≅ $17,704.987

As a result, after 11 years, the account will have a balance of $17,704.987 (about).

To read more about the Compound Interest.

https://brainly.com/question/28020457

#SPJ10

Other Questions
a sample of experienced typists revealed that their mean typing speed is 95 words per minute and the median typing speed is 77 words per minute. the standard deviation of typing speed is 16.9 words per minute. what is the pearson's coefficient of skewness? 11,000 with a 5/10/25 chain discount. Calculate the net price and trade discount the lining of the marrow cavity.target 1 of 5 2. blankcells that can dissolve the bony matrix.target 2 of 5 3. blanklayers of bone matrix.target 3 of 5 4. blanksmall channels that radiate through the matrix of bone.target 4 of 5 5. blankcells that can build bony matrix. What is flexibility? question 1 options: you can touch your toes with your legs straight the ability to move your joints through a full range of motion you are very flexible the ability to perform all stretches perfectly calculate the measure of SR We hold these truths to be self-evident, that all men are created equal, that they are endowed by their creator with certain unalienable rights, that among these are life, liberty and the pursuit of happiness." these are some of the opening lines of what important document? the points (-5,r) and (2,13) lie on a with slope 3 find the missing coordinate r two years ago, an investor bought mutual fund shares. today, if the investor intends to purchase additional shares, she can obtain a reduced sales charge by using: Expand and state your answer as a polynomial in standard form. (4x+y) The ________, who was the head of the ___________ __________, was the most powerful leader in Europe. Which equation in standard form has a graph that passes through the point (2,19) and has a slope of 11/2 i need help can anyone help me please?? 372.2 is what percent of 642 Every hour on the hour, Helen does jumping jacks. At 4:00 she does 4 jumping jacks. At 5:00 she does 5 jumping jacks, etc. How many jumping jacks will Helen do, in total, from the time prior to her final jumping jacks at 4:00 to the time prior to her first jumping jacks at 11:00 ?a) 46b) 56c) 57d) 60 Select the correct answer from each drop-down menu.The United Nations promotesin an effort to maintain world peace and protect future generations. The toxic impact ofnuclear weapons lasts long after its use. Nuclear bombs releasev that poisons the environment and endangers lives.Modern nuclear weapons are so powerful that they have the capacity to wipelarge cities 1 minutes and perhaps cause the end of humancivilization. Find the measure of angles 1 and 2 What ever I'm doing is making the circle equal 410 degrees. Worth 19 points, pls help XY is formed by X(-9,-7) and Y (-3,5 is line j is the perpendicular bisector of XY Given f(x)=-2x-1f(x)=2x1, solve for x when f(x)=-7f(x)=7