Consider the following function. y equals x squared plus 10 x plus 9 Question content area bottom left Part 1 a. Determine if the parabola whose equation is given opens upward or downward. Choose the correct answer below. The parabola opens downward. The parabola opens upward. Your answer is correct. Part 2 b. Find the vertex. The vertex is left parenthesis negative 5 comma negative 16 right parenthesis. (Type an ordered pair.) Part 3 c. Find the x-intercepts. Select the correct answer and, if necessary, fill in the answer box to complete your choice. A. The x-intercept(s) is/are left parenthesis negative 1 right parenthesis comma left parenthesis negative 9 right parenthesis. (Type an integer or a fraction. Use a comma to separate answers as needed.) Your answer is correct.B. There are no x-intercepts. Part 4 d. Find the y-intercept. The y-intercept is enter your response here. (Type an integer or a fraction.)