Trey put three dimes and 2 pennies into his piggy bank how much money did he save

Total in the piggy bank

3 dimes + 2 pennies

(3 × 0.10) + (2 × 0.01)

0.30 + 0.02 = $0.32

Therefore, Trey put $0.32 into his piggy bank.

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

4

step-by-step explanation: