3 years ago

4 and b = 5. Evaluate the given expression when a 2a + 6b HELP

Mathematics

1 answer:

inysia [295]3 years ago

6 0

The answer is 40
2a=2x5 and 6b=6x5
(2x5)+(6x5)
2x5=10
6x5=30
10+30=40

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HELP!! What is the approximate measure of angle x in the triangle shown?

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<h3>Answer: D) 130.5 degrees</h3>

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Work Shown:

$c^2 = a^2 + b^2 - 2*a*b*\cos(C)\\\\10^2 = 5^2 + 6^2 - 2*5*6*\cos(x)\\\\100 = 25 + 36 - 60*\cos(x)\\\\100 = 61 - 60*\cos(x)\\\\100 - 61 = - 60*\cos(x)\\\\39 = - 60*\cos(x)\\\\\cos(x) = \frac{39}{-60}\\\\\cos(x) = -0.65\\\\x = \arccos(-0.65)\\\\x \approx 130.5416\\\\x \approx 130.5\\\\$