1.)simplify the expression: 4 times start root 18 end root plus 5 times start root 32 end root 2.)simplify the expression: 7 times start root 5 end root minus 3 times start root 80 end root 3.)simplify the expression: start root 21 end root times left parenthesis start root 3 end root plus start root 14 end root right parenthesis. 4.)simplify by rationalizing the denominator: start fraction 4 over start root 10 end root minus start root 6 end root end fraction i will make you the brainiest!