If f(x)=69-15x then 
Given :

Lets find out
. The steps to find out f inverse are
Replace f(x) by y

Now we find 
Replace inverse function in the place of x in f(x)

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(3/4) / (1/6)
(3/4) * (6/1) = 18/4 = 4 2/4 = 4 1/2 days
If f(x)=x+1 and then x became 2, you would have the function f(x)=3. So basically for that function you would be going up three over 1. That function is already g(x)=4x. If X became 2, you would have g(x)=8x. The rate of up 8 and then over one. Because of that, g(x) would be higher
Laugh out loud a pun isn't it