Please help me pls please please

Nneeedd 1.find the residual if you know the actual number is 5.2 and the predicted value is 4.8

1. are the triangles similar and if so why? what is the value of x? show your work.

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)