Area of polygons assignment : Please help!

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

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

Gables properties corp. is leasing office building with an area of 49b^2+70b+25. what is the shape of the building? a) rectangle b) square