I solved using but i need to show my work what are the steps in solving please

Can someone me out here and the tell me the greatest common factor

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

Cherie works in retail and her weekly salary includes commission for the amount she sells. the equation s=400+0.15c models the relation between her weekly salary, s, in dollars and the amount of her sales, c, in dollars. interpret the slope of the equation.