Trig homework please help 1-5

What expression is equivalent to 1/2(2+3x-6)

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

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.