Answer:
Option C. is the correct option.
Step-by-step explanation:
The given line in the graph passes through two points (0, 3) and (3, 7).
We have to find the equation of the line.
Since y = mx + c is the standard equation of a line
where m = slope of the line
c = y - intercept
Slope of a line m = 
Now we put the values of x and y to find the slope of this line.
m = 
Since (0, 3) passes through the line
3 = 0 + c
c = 3
Equation of the line will be

Option C. is the answer.
9. Square
10. Square
11. Rectangle
12. Rectangle
13. Square
14. Triangle
Explanation:
I think you may have confused parallel and perpendicular for some of the questions. Also, a cube has square sides and base, so any crossection parallel or perpendicular will also be square. I hope this is helpful!
The answer is 127.16 pi m³, hope this helps.