PLS HELP ANSWER

Geometry. i need step by step explanation on how to do each problem.

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)

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b