Plz help

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Average acceleration: i have no idea how to do this.