Solve the system of linear equations in two variables by elimination or substitution. 3x+y=7 -2x-y=9

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°

[15 points]find the quotient with the restrictions. (x^2 - 2x - 3) (x^2 + 4x + 3) ÷ (x^2 + 2x - 8) (x^2 + 6x + 8)