Answer:
C and D will the correct one
Step-by-step explanation:
Yes you can use the discriminant of a quadratic/polynomial. For instance, if

there is one real root. If

there are two real roots and i

there are no real roots
The discriminant comes from the quadratic equation, which is the following.
Answer:
y=1/2x+3/2
Step-by-step explanation:
use the slope formula m=y2-y1/x2-x1 and get the slope. then plug in one set of points for y and x for (b)
Answer: 70
Step-by-step explanation:
5 multiplied by 7 is 35.
35 - 12 is 23.
23 + 56 is 79.
79 - 9 is 70.