Multiple choice, please help.

Use the quadratic equation y= x2 - 8x + 15 to answer questions 68-72. 68. What is the vertex? A. (-1,4) B. (4,-1) C. (-4,63) D. (-4,31) 69. What is the y-intercept? A. (0, -8) B. (-8,0) C. (0,15) D. (15,0) 70. What are the X-intercepts? A. x = (3,5} B. x = {-5,-3} C. x = {-15,-1} D. x = (1, 15] 71. What is the equivalent form of the equation in vertex form? A. y = (x +4)2 -1 C. y = (x - 4)' +1 B. y = (x -4)3 - 1 D. y = (x +4)2+1 72. Which of the following is the correct graph? V -10 A. B -10 -10 C. D