Answer:

Step-by-step explanation:

The sum of the co interior angles is 180 degrees
Answer:
slope: 20/3 parallel
Step-by-step explanation:
y1-y2/x1-x2 gives you slope(30--10/12-6). Plot the points, create line segments, you'll find that they are parallel.
.8 as a decimal is still .8 but as a fraction idk