What's the answer for 6 - 7/8

Write the expression in simplified radical form. show all steps and work including any foil method work. (hint: use the conjugate. no decimal answers.) (9-2√3)/(12+√3)

Assemble the proof by dragging tiles to the statements and reasons column

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