This is a calculus question. Please solve the following 4 questions below using the rational function on top. Make sure to show all steps and explanations for each part where deemed necessary. Thank you

FUNCTION: f (x) = 5x +9x+9 2 3x +6x+8 9. Determine the intervals of increase and decrease for your function and state the co-ordinates of any local maxima or minima. 10. Determine f"(x) for your function and simplify the equation as much as possible. Make sure your derivative is expressed with positive exponents. 11. Determine all x-values where f"(x) = 0 or where f"(x) is undefined. If your equation cannot be solved algebraically, use technology to solve and make sure to indicate why it was necessary to do so. 12. Determine the intervals of concavity for your function and state the co-ordinates of any points of inflection