28 x 2 = 56 half dollar coins
Answer:
C) π/6
Step-by-step explanation:
The area under the curve from x=-π/2 to x=k is 3 times the area under the curve from x=k to x=π/2.

Graph: desmos.com/calculator/mezlen9hb4
53.35/11 = 4.85 for 1 key chain
4.85 *4 = 19.40