Yoko is mailing packages. Each small package costs her $2.20 to send. Each large package costs her $3.40. How much will it cost her to send 3 small packages and 1 large package?

$10

Step-by-step explanation:

3($2.20)+3.40

6.60+3.40=10

The bigger pizza has a diameter of 14 inches, or a radius of 14 / 2 = 7 inches.

The smaller pizza has a diameter of 12 inches, or a radius of 12 / 2 = 6 inches.

Step-by-step explanation:

The area of a circle is πR2 where R is the radius.

The difference in the size of the pizzas is  

Area of bigger pizza - Area of smaller pizza

= π(7 inches)2 - π(6 inches)2 = = 49π inches2 - 36π inches2 = 13π inches2