Simplify the numerical expression 13-2x5

Is a deceasing linear model or an exponential decay model likely to be a better fit for the data about remembering? ?

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?

Measure of angles 31 (x+4) (3x+9) me