42 inches of wire will cost 168 cents
Look at the pic to see how to set up the proportion.
For cylinder
d=10m
So r=5m
h=5m
volume=pi×r^2×h
=3.14×5×5×5
=3.14×125
=392.5m^3
So option a is correct.
I think construction jobs might use it
If you had a fair coin, the probability of seeing heads is 1/2, meaning you’d see heads 30 times