the length of the side of an equilateral triangle is 40 inches. what is the length of the altitude of the equilateral triangle?Round to the nearest tenth​

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

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?

Simplify the expression below -3(10x+4y)+6(6x-2y)