Help with this question please

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?

Does the point (1, sqrt 7) lie on circle shown.

What number line represents the solution set for the inequality -1/2 greater than or equal to 4