First degree equations and inequalities?

Question

Area of a circle is pie(D divided by 2) to second power. d is y plus 5. y is 1/2 Solve. I got 7.56?

Answer 1

Area = π(D/2)²

If D = y + 5 this equation becomes:

Area = π((y + 5)/2)²

If y = ½ this becomes:

Area = π((½ + 5)/2)²

Area = π((½ + 10/2)/2)²

Area = π((11/2)/2)²

Area = π(11/4)²

Area = π(11²/4²)

Area = π(121/16)

Area = 23.758

Hope this helps you!