Alvin wants to know what his average paddling rate was for a canoe trip to a campsite. On the way there it took him 9 hours against a river current of 3 km/ hr. On the way back, the same distance took him 4 hours with the same 3 km/hr current. Let r = Alvin's average paddling rate.

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

Which expression is rational? 6. , square root two, square root 14, square root 49