well, p + (-2), now a sign in front of a grouping symbol usually means it has a 1*, so +(, really means +1*, thus p + (-2) really means p + 1*(-2), which gives us p - 2, and that'd be ordinally, 2 numbers to the left of "p".
likewise, 5 + p, is just the same as p + 5, so that value will be a number 5 numbers to the right of "p".
just as above, p + 1, is just one value to the right of "p".
![\bf \rule[0.35em]{2em}{0.25pt}\stackrel{p-2~\hfill }{|\rule[0.35em]{2em}{0.25pt}}|\rule[0.35em]{2em}{0.25pt}\boxed{P}\stackrel{~\hfill p+1}{\rule[0.35em]{2em}{0.25pt}|}\rule[0.35em]{2em}{0.25pt}|\rule[0.35em]{2em}{0.25pt}|\rule[0.35em]{2em}{0.25pt}|\stackrel{~\hfill p+5}{\rule[0.35em]{2em}{0.25pt}|}\rule[0.35em]{2em}{0.25pt}|](https://tex.z-dn.net/?f=%5Cbf%20%5Crule%5B0.35em%5D%7B2em%7D%7B0.25pt%7D%5Cstackrel%7Bp-2~%5Chfill%20%7D%7B%7C%5Crule%5B0.35em%5D%7B2em%7D%7B0.25pt%7D%7D%7C%5Crule%5B0.35em%5D%7B2em%7D%7B0.25pt%7D%5Cboxed%7BP%7D%5Cstackrel%7B~%5Chfill%20p%2B1%7D%7B%5Crule%5B0.35em%5D%7B2em%7D%7B0.25pt%7D%7C%7D%5Crule%5B0.35em%5D%7B2em%7D%7B0.25pt%7D%7C%5Crule%5B0.35em%5D%7B2em%7D%7B0.25pt%7D%7C%5Crule%5B0.35em%5D%7B2em%7D%7B0.25pt%7D%7C%5Cstackrel%7B~%5Chfill%20p%2B5%7D%7B%5Crule%5B0.35em%5D%7B2em%7D%7B0.25pt%7D%7C%7D%5Crule%5B0.35em%5D%7B2em%7D%7B0.25pt%7D%7C)
Since it is about only the outer part of the aquarium which is made of glasses we need to calculate the total surface area.
Surface area of the base = 4*3 = 12 square feet
Surface area of the shorter length of wall = 3*2 = 6 square feet
since it has another wall in opposite side. It has to be multiplied with 2.
6*2 = 12 square feet
Surface area of the longer length of wall = 4*2 = 8 square feet
since it has another wall in opposite side. It has to be multiplied with 2.
8*2 = 16 square feet
Therefore the total surface area that need to be covered with glasses
12+12+16 = 40 square feet
Just subtract a number below 10 and get a answer
I think it is 8,4 let me now if it is right
