How many delta v to get a 100 ton payload into LKO ksp

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

Ill mark the brainliest if you me with the these three questions 7,8,9

Solve x+3y=6 and 4x-6y=6 by elimination . show work !