I’m not sure what it’s asking

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

Given abcd ac=38 and ae=3x+4 find the value of x