What direction does the parabola open for the equation y = -x2 - 9x + 10?
a. Right side
c. Downward
d. Upward
. Which of the following statements characterize the table of quadratic function?
a. Equal differences in x produce equal first differences in y.
b. Equal differences in x produce equal second differences in y.
C. Equal differences in y produce equal first differences in x.
d. Equal differences in y produce equal second differences in x.​