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Luda [366]
3 years ago
13

Anyone know this ? picture shown please help

Mathematics
1 answer:
valina [46]3 years ago
5 0

They're just after some straightforward algebra starting from the Law of Cosine.  We don't have to evaluate any trig functions or anything like that.

c^2 = a^2 + b^2 - 2ab \cos C

We move the c² and the cosine term to their other sides,

2ab \cos C = a^2 + b^2- c^2

That's it for the algebra.  

a,b and c are the side lengths opposite A,B and C respectively.  So a=4, b=5, c=2.

We substitute:

2ab \cos C = 4^2 + 5^2- 2^2 = 16 + 25 - 4 = 37

Answer: A. 37

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Answer:

The sample size is 183.

Step-by-step explanation:

Given:

σ = $1050, ppulatin standard deviation

99% confidence interval

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The accuracy is given by

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Therefore

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n = 182.9

<em>The sample size is 183</em>

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3 years ago
Is -3.7 less than,greater than or equal to -3.8 ?<br>​
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