Answer:
Step-by-step explanation:
We need to go from area to radius to circumference.
Formula for the area:
Solve for r;
Divide by pi
Extract the square root.
Plug in the value of the area.
Now that you've found the radius, use the circumference formula to calculate it.
30
Multiply: 5z+20+10-5z
Simplify: Both z's cancel and you get 30
The answer to your question is m/s which is the A
68