Answer:
x = 2
Step-by-step explanation:
AB/BC = AD/DE
=
cross-multiply:
2+x = 4
x = 2
6b < 24 or 4b + 12 > 4
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<h3>Answer: 
</h3>
Explanation:
The identity we'll use is cos(-x) = cos(x) for any value of x.
So cos(-150) = cos(150).
Then locate the angle 150 on the unit circle. The terminal point is
The x coordinate of this terminal point is the value of cos(150).