Devante went to the college traveling 15 mph and returned home traveling 6 mph. if the total trip took 7 hours, how long did devante travel at each speed?

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?

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

A50% increase followed by 33 1/2% decrease