Subtract and write your answer as a mixed number 9 4/5 - 7 1/2

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)

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.