Ignore the other ’s the answer to #7 and 9?

Why did the ice arena get so hot after the big game (this is math related google it to find the paper

Triangle xyz has vertices x(1,3), y(0,0)

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?