18x^2 = 3x . w tell me how

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

Find the y-intercept and x-intercept for the equation 5x-3y=60 what is the y-intercept

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)