Graham had to pay $22,000 of student loans when he graduated. by the following year, his debt had been reduced to $15,200. how much of his debt did he pay off during that year?

Solve the system of equations y= 3/2 - 1, -x+ y =-3

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)

Apatient is to be given 35 milligrams of demerol every 4 hours. you have demerol 50 milligrams/milliliter in stock. how many milliliters should be given per dose?