Ana uses Talk-A-Lot and Peter uses Talk-to-Me. Each company charges the same amount per hour of talk time, however Ana and Peter will never
be charged the same amount. Write a system of equations that could
represent the situation. Explain.

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

What is the slope of (0,32) and (100,212)

Use the squared identities to simplify sin^2x cos^2x