Rewrite <span>2cos x + 1 = 0 as:
2 cos x = -1, and then cos x = -1/2
x must be in Quadrant II or Quadrant III, since the adj. side is negative.
Note that the angle 120 has adj. side -1 and hyp 2. So 120 degrees is one solution.
Now what about a possible 2nd solution, to be found in Quadrant III? That would be -120 degrees, which has the same terminal line as does 240 degrees.
No soap.
So, the solution is 120 degrees.</span>
Answer:
C. 15
Step-by-step explanation:
You just need to add the number of dots, hoped this helped and was fast enough
Inequality : 2n + 2 > 16
2n > 16 - 2
2n > 14
n > 14/2
n > 7
-> Answer C
<span>Divide by 3 and get x<1, so the answer is {x | x < 1}
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