6.5x2 - 20.4x + 234 x2 + 36 minutes after a person eats food containing sugar. 3. The function f(x) : models the pH level, f(x) oi the human mouth x a. Determine to the nearest tenth the pH level of the human mouth 42 minutes after a person eats food containing sugar. b. What is the equation of the horizontal asymptote associated with this function? Describe what this means in terms of the mouth's pH level over time