Question

Need help with 15... thx

Answer 1

8 x 1.25 = 10
10 x 10 = 100

Answer 2

8 x 8 = 64
1.25 x 2 = 2.5
2.5 + 8 = 10.5
10.5 x 10.5 = 110.25
110.25 - 64 = 46.25
46.25 inches^2