Which function has an inverse that is a function?

Ob (x) = x2 + 3

Od (x) = - 9

Om (x) = - 7x

O p (x) = |x|

m (x)

Step-by-step explanation:

they would have to pass the horizontal line test and the vertical line test for both the origional and the inverse.

b (x) does not pass the horizontal line test in any of the y values over 3

d (x) does not pass the horizontal line test for y=-9

p (x) does not pass the horizontal line test for positive y values

and m (x) has only one corresponding x value for every y value