3 years ago

Please help got stuck again with this one Thank you

Mathematics

2 answers:

wlad13 [49]3 years ago

6 0

Yes it is B because 2*2*2=8 and 2 cubed=8 too!!!!!

Neko [114]3 years ago

4 0

The answer is 2 cubed so B

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Answer:

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Step-by-step explanation:

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What is the ratio of x to y?

xeze [42]

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3 years ago

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Suppose that the terminal side of angle alphaα lies in Quadrant I and the terminal side of angle betaβ lies in Quadrant IV. If s

melamori03 [73]

Solution :

It is given that :

$\alpha$ lies in the first quadrant.

And $\beta$ lies in the fourth quadrant.

Since, $\sin \alpha = \frac{5}{13}$ and $\cos \beta = \frac{6}{\sqrt{85}}$ (given)

$\sin \alpha = \frac{5}{13}$

$\cos \alpha = \sqrt{1-\sin^2 \alpha}$

$\cos \alpha = \frac{12}{13}$

Similarly $\cos \beta = \frac{6}{\sqrt{85}}$

$\sin \beta = \sqrt{1-\cos^2 \beta}$

$\sin \beta = \sqrt{1-\frac{36}{85}}$

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Therefore,

$\cos (\alpha + \beta) = \cos \alpha \cos \beta - \sin \alpha \sin \beta$

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$= \frac{107}{13 \sqrt{85}}$

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3 years ago