Can some one me with this math problem ?

Find the value of x for which the lines are parallel.

Asphere has a diameter of 10 in. what is the volume of the sphere?

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?