Sales price is 67.50 sales tax is 5% how much is the total amount paid

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.

The mass of a marine organism, in pounds, p years after it is born is given by the polynomial function r(p) = -4p2 + 300p. find the mass when p = 20 years.

Asmall book publisher knows that 26 books weigh 41 lbs. how much do 40 books weigh?