Will give 50 pts
another question is

which pairs of functions are inverse of each other? choose all that is correct

a. f(x) = 2x + 3 and g(x) = 0.5x - 3

b. f(x) = 1/6x - 2 and g(x) = 6x -12

c. f(x) = 1/3x + 5 and g(x) = 3x - 15

d. f(x) = x^2 +7 and g(x) = + or - squared x-7

C. f(x) = 1/3x + 5 and g(x) = 3x - 15

f^-1(21) = 5

Step-by-step explanation:

To find the inverse. we exchange x and y and then solve for y

A. f(x) = 2x + 3 and g(x) = 0.5x - 3

y = 2x+3

x = 2y+3

x-3 = 2y

(x-3)/2 =y

This is not g(x)

B. f(x) = 1/6x - 2 and g(x) = 6x -12

y = 1/6 x -2

x = 1/6 y -2

x+2 = 1/6 y

6x +12 =y

This is not g(x)

C. f(x) = 1/3x + 5 and g(x) = 3x - 15

y = 1/3 x+5

x = 1/3 y +5

x-5 = 1/3 y

3x-15 =y

This is g(x) so it is the inverse

D. f(x) = x^2 +7 and g(x) = + or - squared x-7

y = x^2 +7

x = y^2 +7

x-7 = y^2

±sqrt(x-7) = y

This is not g(x)

3.  f^-1 (21) = ?

f(x) = 2x+11

The functions are inverses so the input of 1 is the output of the other

f(a) = b means f^-1 (b) = a

We want to know when y =21

21 = 2x+11

Subtract 11 from each side

21-11 = 2x+11-1

10 = 2x

Divide by 2

10/2 = 2x/2

5 =x

f^-1(21) = 5

the camry sales+accord sale=828,000. to make it so the two numbers are 18 thousand apart and still equal 828,000, you first need to find out what half of 828,000 is. 828,000/2=414,000. for the two numbers to equal 828,000, you have to add the same amount as you subtract from the middle. in this case, the number is 9,000 because it's half of 18,000. to equal 828,000, you have to add 9,000 to 414,000 for the camry and subtract 9,000 from 414,000 for the accord. 414,000+9,000=423,000.

414,000-9,000=405,000.

423,000+405,000=828,000.

423,000-405,000=18,

hope it