What expression is quadratic monomial?

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

Atotal of 766 tickets were sold for the school play. they were either adult tickets or student tickets. there were 66 more student tickets sold than adult tickets. how many adult tickets were sold?

|2x - 6| > 10 {x|x < -8 or x > 2} {x|x < -2 or x > 8} {x|-2 < x < 8}