Simplify the complex fraction 2 3/4 over 1 1/8

Which expression is equivalent to (9x - 3 1/ + 1 3/8)

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?

If y varies directly as x2 and y=6 when x=6, find the constant of variation.