Answer:
to get the answer add the -9 and the 3 to get 6,
Step-by-step explanation:
f^-1 (x) = x/5
f(x) = 5x
Replace f(x) with y
y= 5x
Exchange x and y
x = 5y
Solve for y
Divide each side by 5
x/5 = 5y/5
x/5 = y
The inverse is x/5
it will take about 6 months
-4
by finding the exact value.