I did not get this question. Offering up 50 points need it by 8:00

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

Aparachutist descends 38 in 2 seconds . express the rate of the parachutists change in height as a unit rate

Mason bought 8 1/4 feet of wire. he cut off a piece of wire 3 5/12 feet long and used it for his science project. how much wire did mason have left?