Answer:
22.2 ft²
Step-by-step explanation:
The area (A) of a sector is calculated as
A = area of circle × fraction of circle
= πr² × 
= π × 7.13² × 
=
≈ 22.2 ft² ( nearest tenth )
You got the b part wrong. It would be 4B+4C/2=4D
Answer: 45
Plug in 150 for s in the equation and solve
Your probability of picking a white ball is going to be 67%