Here, we have: A(r) = 4πr²
We need to calculate it for r = 6,
A(6) = 4π(6)²
A(6) = 4π(36)
A(6) = 144π
In short, Your Answer would be Option D
Hope this helps!
Check the picture below.

since the width is just a dimension unit, it can't be -31.
what is the length? well, the length is w + 30.
Can't answer.
Needs number of rentals from that day.