A light bulb manufacture claims that the mean life of a certain light bulb is 750 hours. The three you purchased only lasted 700 hours. State the null and alternative hypothesis.

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?

If you are just building your payment history, how many points from a perfect score will you possibly miss?

How do you find the circumfrance of a circle?