How to find slope using a tiny table

If the discriminant if a quadratic equation is 4 which statement describes the roots?

Which image (a’ b’ c’ d’) of abcd cannot he produced using only reflections ?

The lengths of two sides of a triangle are 9 and 15. what can be said about the length of the third side? a. it must be greater than or equal to 6 and less than 24. b. it must be greater than or equal to 6 and at most 24. c. it must be greater than 6 and less than 24. d. it must be greater than 6 and at most 24.