I need help with this problem

The height of a triangle is 4 in. greater than twice its base. the area of the triangle is no more than 168 in.^2. which inequalitycan be used to find the possible lengths, x, of the base of the triangle?

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

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