Answer:
B
Step-by-step explanation:
Using the cosine ratio in the right triangle and the exact value
cos30° = , then
cos30° = = = ( cross- multiply )
2x = 20 ( divide both sides by 2 )
x = 10 → B
Slope intercept: y = mx + b
Subtract 8x
-4y = 20 - 8x
Divide by -4
Y = -5 + 2x
Switch around
Solution: y = 2x - 5
a straight line = 180 degrees
so the missing angle is 180 - 130 = 50 degrees
1 - 65
2 - 115
3 - 65
4 - 115
5 - 65
6 - 115
7 - 65
8 - 115