Which expression is equivalent to the polynomial 60x-50

Me. drysdale earned 906.25 in interest in one year on money that he had deposited in his local bank if the bank paid an interest rate of 6.25% how much money did mr. drysdale deposit

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.