Alarge pizza has a diameter of 35cm. 2 large pizzas cost $19.99 a medium pizza has a diameter of 30cm. 3 medium pizzas cost $24.99. which os the better deal? (2 large pizzas or 3 medium pizzas)

So first we need to find the area of both using a=3.14*radius*radius

to find the radius we need to divide 35 by 2 (large) and 30 by 2 (medium)

lets do the large first since the raidus is 17.5 we put it into a=3.14*17.5*17.5

and then we get 961.63, for the medium we do a=3.14*15*15 which is 706.50

now for the large 961.63 * 2 is 1923.26 and the price is 19.99 

for the medium we do 706.50 *  3 which is 2119.5 and costs 24.99

So the medium pizzas are a better deal

It would take her 20 minutes.