At a pet store, there are 30 aquariums. Of the 30, 20 have fresh water with 15 fish in each. The other 10 aquariums have salt water fish with 6 fish each. Which equation could be used to find f, the total number of fish at the pet store?

stop cheating you cant get the answer boi

Step-by-step explanation: no you cant get it

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

think about it deeply and passionately about this property

i am sorry