A composite number is one that can be made by multiply two numbers to each other. Since 49=7*7, 49 is a composite number.
Check:
You can check a multiplication chart, but you will see that 49 is the only one that can be multiplied by 2 numbers
The 2 lines are parallel, so the 2 sides(e.g. 1 and 2/ 3 and 49) add up = 180 and In this case the 2 sides are equal as u can see from the original diagram so the angle of 2 is 180-49=131.
18?
-18 divided by [-1/6]
is 18
hopefully that's what you were looking for.?!!
You are adding 9/3 each time
so 2/3, 11/3, 20/3, 29/3, 38/3, 47/3
hope this helps