“below are in standard form and explain why.” who’s correct?

Simplify 4 square root of 2 end root plus 7 square root of 2 end root minus 3 square root of 2 . (1 point) 2 square root of 8 8 square root of 2 8 square root of 6 6 square root of 8

What is the sum of these mixed numbers 2 1/8 + 4 3/8

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