A parabola intersects the x-axis at x = 3 and x = 9.
What is the x-coordinate of the parabola's vertex?

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?

The weights of broilers (commercially raised chickens) are approximately normally distributed with mean 1387 grams and standard deviation 161 grams. what is the probability that a randomly selected broiler weighs more than 1,425 grams?

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x