Dylan went to the study group traveling 4 mph and returned home traveling 10 mph. If the total trip took 7 hours, how long did Dylan travel at each speed?

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.