Which is the equation of a parabola with vertex (4,3) and directrix x = 6?

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?

Find the value of the variable and the length of each secant segment.

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.