What is the image of the point (-8,0) after a rotation of 270° counterclockwise about the origin?

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?

The perimeter of a rectangle is greater than or equal to 74 meters. if the length is 25 meters, the minimum width of the rectangle is meters.

I’m stuck on this equation, anyone got the answer?