I wanna sleep

But i cant cause of this homework

If f(x)= 3x+6 which of the following is the inverse of f(x)

Which of the following is true for the relation f(x)=2x^2+1

You dug a hole that was 8 feet deep. after taking a short break, you dug down 3 more feet in the same hole. when finished digging, a tractor accidentally filled the hole with 4 feet of dirt. how deep is your hole now?