A crew lays 100 bricks per hour. The crew's job requires them to lay 950 bricks, and 200 have already been laid. In which equation does h represent the number of hours needed to finish the job?
A. 100h + 200 = 950
R
B. 100h - 200 = 950
C. 100 + 200h = 950
D. 100 - 200h = 950

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?