Solve for x 3.8 4.8 5.8 6.8

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

Find the vertex of the function given below y=x^2-6x+1

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?