A6-foot-tall man casts a shadow that is 30 feet long . if a boy standing next to the man casts a shadow that is 12 feet long , how tall is the boy

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?

Can you me find the missing length. i attached an image.

Simplify -4z+2y-y+-18z a.-22z+y b.-14z+2 c.3y+22z d.y +14z