Which number is equivalent to (1/3)^-4

A.12
B.81
C.1/12
D.1/81

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)

Molly shared a spool of ribbon with 12 people. each person received 3 feet of ribbon. which equation can she use to find r, the number of feet of ribbon that her spool originally had?

Complete the solution of the equation. find the value of y when x equals -5. -4x - 8y = -52