C) Adjacent angles whose exterior sides are perpendicular rays are complementary.
Complementary = add up to 90
Supplementary = add up to 180
4 groups of 3 girls and 3 boys. Then there would be an extra three girls
No.
If you substitute x with 2 and y with 3, it doesn't equal meaning its not a point.
It equals 1 because 2÷2=1 so 1=1
I hope this helped