Answer:
= 1/3
Step-by-step explanation:
= 
if f(x) = y,
= x, so
= 3 since f(3) = 52
finding f'(3)
f'(x) = 3
f'(3) = 3
= 1/f'(x) = 1/3
Step-by-step explanation:
5.|12 - r| > 15
|12 - r| > 15/5
|12 - r| > 3
12 - r < -3 or 12 - r > 3
-r < -3 - 12 or -r > 3 - 12
-r < -15 or -r > -9
r > 15 or r < 9