The cheese that ms. carter used to buy costs $6.00 per pound, but it's been marked up to 15%. suppose ms. carter buys 3.5 pounds of cheese. how much more does it cost at the new price than at the old price?

Original price: 
6(3.5)
21
New Price:
1.15(21)
24.15

24.15-21
$3.15 more

At the old price of $6.00 per pound, that would cost $21.00. If the cheese price is marked up 15%, then it will cost 6 x1.15=$6.90/ pound. So the new cost would be $6.90 x 3.5 = $24.15. So in other words, it would now cost $3.15 more in total for the 3.5 pounds. 

A= r2 × 3.14 7x7 ↓ ↓ 49 × 3.14 = 153.86 → 153.9

Ithink it’s b because it say 3 plastic rings and all the balls