Solve the summation from n equals 2 to 9 of negative 3 plus 5 times n. 196 198 243 248

Which term best describes the association between variables a and b

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Simplify (4x^2 - 8xy + 2y^2) - (9x^2 - 4xy - 7y^2) a. -5x^2 + 4xy + 9y^2 b. -5x^2 - 4xy + 9y^2 c. -5x^2 + 12xy + 4y^2 d. -5x^2 - 4xy - 5y^2