Help plz..And No links

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?

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?

What is the domain of the step function f(x)=[2x]-1?