What is the special name for the perimeter of a circle

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

In priyas math class there are 10 boys and 15 girls. what is the ratio of boys to girls in priyas math class? express your answer as a decimal

1. evaluate 8x(2)y9(-2) for x=-1 and y=2 2. simplify the equation. -() 3. simplify the expression. [tex]\frac{5}{x(-2) y9(5)}[/tex]