2p + 21 is what it equals hope it helps and have a great day!
Y+60=180 then y=120
5z-100=60 then 5z=160 then z=32
So assuming pi represents 1 term or the ratio of the diameter to the circumfernce and B5 means B times 5 and not B^5
65pi=B5
divide both sides by 5
(65pi)/5=B
simplify
13pi=B