Which doubles fact would you use to find 6+7 a. 2+2=4 b. 4+4=8 c. 6+6=12 d. 8+8=16

Which statement is true about the extreme value of the given quadratic equation? a. the equation has a maximum value with a y-coordinate of -21. b. the equation has a maximum value with a y-coordinate of -27. c. the equation has a minimum value with a y-coordinate of -21. d. the equation has a minimum value with a y-coordinate of -27.