What is the answer to y is equal to 3x to the 2 power minus 3x minus 18

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?

Wrote and expression for the difference of p and 4

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.