Please answer i have 2 boys fighting over which one is correct and we’re in a group pls answer I need help

What are “like terms”? why can we only add like terms?

Find the value of the variable and the length of each secant segment.

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?