Write and equation that represents the graph

The speeders soccer team charged $12 to wash each car at a fundraiser car wash.the team collected a total of $672 by the end of the day.how many cars did the deal wash?

In a fifth grade class, 3/5 of the girls have brown hair. of the brown-haired girls, 3/4 of them have long hair. of the girls with long brown hair, 1/3 of them have green eyes. what fraction of the girls in the class have long brown hair?

Find the absolute maximum and minimum values of f(x.y)=x^2+y^2-2x-2y on the closed region bounded by the triangle with vertices (0,0), (2,0), and (0,2)