Which is the simplified form of the expression 3(7/5x+4)-2(2/3-5/4x)

Brook states that the distance on the line is 4 units. caleb states that the whole line does not have a distance because it continues on forever. vivian states that the line is 6 units long. which distance did brook measure? which distance did vivian measure?

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

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie