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OverLord2011 [107]
3 years ago
13

Which expression is equivalent to 3x+10−x+12 a.24x b.4x + 22 c.26x d.2x + 22

Mathematics
1 answer:
jok3333 [9.3K]3 years ago
8 0
The answer is:  [D]:  2x + 22  .
______________________________________________
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Trig///HELPP PLEASE!! i’ve been stuck on this for 30 minutes!!
ddd [48]

Answer: There are two solutions and they are

theta = 135

theta = 225

=============================================================

Explanation:

Recall that x = cos(theta). Since the given cosine value is negative, this indicates x < 0. Theta is somewhere to the left of the y axis, placing it in quadrant 2 or quadrant 3.

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You're looking for points on the unit circle that have x coordinate equal to x = -sqrt(2)/2. Those two points correspond to the angles of 135 and 225, which are in quadrants 2 and 3 respectively.

--------

I recommend using your calculator to note that

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cos(135) = -0.70710678

cos(225) = -0.70710678

The decimal values are approximate. Make sure your calculator is in degree mode. Because those three results are the same decimal approximation, this indicates that cos(135) = cos(225) = -sqrt(2)/2.

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What's 57.8 divided by 81 using compatible numbers?
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you can estimate 57.8 and 81 then to check you can do 57.8 divided by 81
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