Ab=45. if rt=3(x+9), what is the value of x?

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

Nine more than four times a number is the same as one less than twice the number. find the number?

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?