The lines through point a(-2,4) and line b(5,d) have a slope of 3 find d

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°

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)