What is the inverse of f if f(x)=3√x-4

Can someone me and do the problem plz so i can understand it more better

What is the value of x in the this question ?

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)