Aballoon has a circumference of 28 in. use the circumference to approximate the surface area of the balloon to the nearest square inch.

Okay so use the surface area= 4x pi x r^2

circumference = 2x pi x r

28 = 2x pi x r

28/2x pi= r
radius = 4.5 ins

surface area = 4x pi x 4.5^2
surface area = 254.5 ins^2
surface area = 255 ins^2 (to the nearest square inch)

On monday,mrs.wise bought 3 lbs of apples at $4per lb= 4*3=$12on tuesday ,20%off and she buy 5 lbs of apples = $4-20%=3.20*5lb=$16example: other wise when she buy 5lbs on monday she have to spend 4*5=20