The half life of a radioactive kind of cadmium is 14 years. How much will be left after 28 years, if you start with 72 grams of it?

Florence price's brownies and more sells all types of cookies and pastries. on tuesdays, they markdown all brownies 75% to a sale of $1.50 a dozen. find the selling price and the markdown of a dozen brownies.

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.