1. {(-1, -9), (0, -5), (4,3), (6, -2)}
D=
R = _
Function?

Guys i really need or i have to stay late up night

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?

Plz hurry evaluate the expression a+b where a=8 and b=19