What is the square root of -72x to the 5th power

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

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

Solve 2x+y=3 x+y=5 in substitution method