Posted by **brianna** on Friday, November 4, 2011 at 8:44am.

Let g(x) = 0.5x + 18. Write the rule for g-1(x). Then, evaluate g-1(x) at x = 20. Enter this result in the space provided.

- college algebra -
**Writeacher**, Friday, November 4, 2011 at 8:49am
Your umpteen posts have been removed.

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- basic algebra -
**drwls**, Friday, November 4, 2011 at 9:10am
Let y = g(x) = 0.5x + 18

0.5x = (y-18)

x = 2y -36.

Switch x and y for the inverse function, and x becomes the inverse function g^-1(x)

g^-1(x) = 2x - 36

g^-1(20) = 4

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