12. Determine whether each pair of functions are inverse functions.

The answer is 2nd point

Step-by-step explanation:

In this question, inverse of f(x) is equals to g(x). First, you must know how to find the inverse of f(x). In order to find the g(x), you must let f(x) = y and make x thd subject :

1.

Let y = (10x+9)/8

y = (10x+9)/8

8y = 10x + 9

8y - 9 = 10x

(8y-9)/10 = x

x = (8y-9)/10

g(x) = (8x-9)/10 (Remember to convert y back to x)

2.

Let y = x - 9

y = x - 9

y + 9 = x

x = y + 9

g(x) = x + 3

Next, by looking in no.1, the inverse of f(x) is wrong and in no.2, it shows the correct form of inverse. So only 2 is an inverse function

astronomers is your final answer! : )