-7x^3-x-2y^3+3y^3-x^3+3y^3-3x

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

Find the domain and range of the following function f(x) = 51x - 21+ 4

What is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?