You can put this solution on YOUR website! (18n^2)/(4n^2 )⋅(9n-90)/3
(9/2)*9(n-10)/3
(9/2)* 3(n-10)
I am assuming the first fraction is multiplied by the second fraction, not that the denominator has two parts. If it does, then the answer would be (9/2*3(n-10)) or (3/2(n-10))