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3 years ago

12

Some friends made a salad for a party. there were 28 people at the party including the friends. they bought enough cherry tomato

es for everyone to get 3 cherry tomatoes each. how many charry tomatoes did the friends buy?

1 answer:

zubka84 [21]3 years ago

8 0

Just do 28 times 3 and you will get 84 to check this just divide 84 to 28.....

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

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

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

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

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

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3 years ago