30% of what equals 180

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

How do i do this activity, is appreciated

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.