3 years ago

If 25% of a number is 20, what is 60% of the number

Mathematics

2 answers:

Sergeeva-Olga [200]3 years ago

8 0

Set up a proportion, 20 over 25% and x over 60% a

Iteru [2.4K]3 years ago

7 0

Set up a proportion, 20 over 25% and x over 60% and the answer is 48

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Simplified form of 12x-1 = 2(6+5x) +7

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2 years ago

Sin α = 21/29, α lies in quadrant II, and cos β = 15/17, β lies in quadrant I Find sin (α - β).

Sever21 [200]

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

$\sin\alpha=\dfrac{21}{29}\implies \cos^2\alpha=1-\sin^2\alpha=\dfrac{400}{841}$

Since $\alpha$ lies in quadrant II, we have $\cos\alpha$ , so

$\cos\alpha=-\sqrt{\dfrac{400}{841}}=-\dfrac{20}{29}$

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So

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