Can someone please explain how to do this? ​

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

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)

Find cot x if sin x cot x csc x = √2