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Andrews [41]
3 years ago
9

suppose you go to a concert and purchase 3 identical t-shirts and a hat. the hat cost $21 and you spend $60 in all how much does

each t-shirt cost ?
Mathematics
2 answers:
Aneli [31]3 years ago
4 0
If the hat costs 21, and you spent 60, subtract 21 from 60 and you get 39. then divide 39 by how many t-shirts, so 39/3 = 13. so each t-shirt should cost $13
Marianna [84]3 years ago
3 0
Ok, first you subtract 21 from 60.
That gives you 39, so you then divide that by 3.
That gives you 13, so each t-shirt cost $13.
Hope this helps
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Convert the Cartesian equation (x 2 + y 2)2 = 4(x 2 - y 2) to a polar equation.
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{r}^{2}  = 4  \cos2\theta

<u>EXPLANATION</u>

The Cartesian equation is

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{( {r}^{2} )}^{2}  = 4(( { r \cos\theta)  }^{2} -  {(r \sin\theta) }^{2}  )

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Divide through by r²

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Apply the double angle identity

\cos^{2}\theta -\sin^{2}\theta=  \cos(2 \theta)

The polar equation then becomes:

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