What is 3 tenths more than 5.8

Find the complete factored form of the polynomial 40m^3n^2+45m^2n^6

Simplify 5 square root of 7 end root plus 12 square root of 6 end root minus 10 square root of 7 end root minus 5 square root of 6 . (1 point) 5 square root of 14 end root minus 7 square root of 12 5 square root of 7 end root minus 7 square root of 6 7 square root of 12 end root minus 5 square root of 14 7 square root of 6 end root minus 5 square root of 7

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles