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 .

You eat 8 strawberries and your friend eats 12 strawberries from a bowl. there are 20 strawberries left. which equation and solution give the original number of strawberries?

If 25% of y is 30, what is 60% of y?

If f(x) = 3x2 - 2x+4 and g(x) = 5x + 6x - 8, find (f-g)(x).