Okay so I stumbled upon this question and I think I may be on the right track but request backup..
A store handles a specialty item that has a marginal cost of $24 and a fixed cost of $360. The sales required to break even are 75 items.
A) Find the linear cost function
My answer was --> c(x) = 24x+360 did you forget the x ?
B) Find the linear revenue function
My answer was --> R(x) = px -->R(x) = 384x R(x) = C(x) at the break even point
p = selling price
75p = 24(75) + 360
p = 28.80
R(x) = px = 28.80x