The difference of mai's age and 12 is 60

For the given quadratic equation convert into vertex form, find the vertex and find the value for x=6 y=-2x^2+2x+2

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?