5. For what value of A would the following equations satisfy?
AXA = A and A+A=A

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?

How can you check that you have correctly converted frequencies to relative frequencies?