Let x represent the number of years since 2000 and let y represent the number of coin collection. The number of coins in the collection from 2000 to 2010 can be modeled by the function y=(3x)^2+(25x)+25. In what year did the coin collection have 155 coins?

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?