Pls help (finals) i’m not able to figure it out

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

For what value of x does 4x = (1/8) x + 5?

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)