B. Because of the slope and where it the lines intersect the y axis
249 km in 3 hours are 83 km in 1 hours
249 : 3 = 83 Km
For the first part, the answer is choice B) 360. This applies to any polygon and it doesn't have to be an octagon. The sum of the exterior angles of any polygon is always 360 degrees. This is something you should memorize or have on a reference sheet.
For the second part, the answer is choice C) 142 degrees. We have a parallelogram (specifically a rhombus but that doesn't matter) so the adjacent angles are supplementary. This means they add to 180 degrees. Solving x+38 = 180 leads to x = 142
Answer:
Can you show the whole page we?
21x-33°=180°-135°
21x=12°
x=12/21
