How to add it because i don not know how to do it

What is the length of an with endpoints a 3,2 and b 8,14

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?

What’s the answer ? use the picture to see the problem