What is the surface area of a cube that has sides 4 cm long?

Given that (x-3) is a factor of f(x)=x^3+ax^2-x-6, find a and hence the number of real roots or the equation f(x)=0

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

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