Can you pls help me 15 point you will earn???

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?

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

The function f(x)= -(x+5)(x+1) is down. what is the range of the function?