8.4y−3.6y=48.96 i need help

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?

Describe the domain and range of y=2(3)^x-2+5

Joe has some money in his bank account he deposits 45$ write an expression that represents the amount of money in joe's account