For how many integral values of n are the numbers 2n, 3n and 10 - n the lengths of the sides of an obtuse triangle? ∵ a correct answer + a good explanation will guarantee you a :)
(This is from AMC 10 so if you answer it, Congrats! Ur rlly smart and everyone knows it :)

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.