The equation -2(3y+7) = 28 is solved in several steps below. For each step, choose the reason that best justifies it.

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 expression is the factorization of x^2+10+21

How do you find the rate of change using a graph?