-2/5x -2= 18
-2/5x=18+2
Divide -2/5 with both sides
x= -50
Answer:
2.1
Step-by-step explanation:
By the Law of Cosines,
a² = 5² + 6² - 2(5)(6)cos(20°)
a = sqrt(5² + 6² - 2(5)(6)cos(20°)), which is about 2.1
Answer:
B(7,10)
Step-by-step explanation:

Answer:
The answer is B
Step-by-step explanation:
Because tan theta > 0 and cos theta is negative this angle is in the third quadrant.
angle whose cos is 2/5 is 66.42 degrees
The required angle is 180 + 66.42 = 246.42 degrees answer.