What the inverse of y= 100 - x^2

The inverse would be y = -100 + x^2

Step-by-step explanation:

To find the inverse of a function, switch the signs of everything.

In this case, make the 100 be negative and the x^2 be positive.

I also graphed the equations below to show you how they are inverse functions.

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

there are no answer choices

step-by-step explanation: