Find the vertex and axis of symmetry

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

∆red ≅ ∆ by rule will give brainiest if possible

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%