Si el radio de una circunferencia disminuye en 50% ¿en que porcentaje varia su area?

Twelve friends shared 8 small pizzas equally.how many pizzas did each person get?

On a piece of paper graph f(x)=5•(0.4)^x

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?