What is 1/5x^2=-20???

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

Y=(x+3)(x-4)(x+1)^2 sulutions? multiplicity?