-7 2/3+(-5 1/2)+8 3/4

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 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)