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3 years ago

What's the answer to this?: divide 33 photos into two groups so the ratio is 4 to 7

Mathematics

2 answers:

velikii [3]3 years ago

5 0

total units of ration = 4 +7=11

so, ratio would be (4*33)/11 : (7*33)/11

12 : 21 is the answer.

Did you understand?

Alex17521 [72]3 years ago

4 0

21 would be the answer do the math

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Precalculus PLEASE HELP ME right answers only check all please

Alex_Xolod [135]

Given :

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We know the identity

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We use this property to simplify the left hand side

So $cos(x)cos(\frac{\pi }{7}) + sin(x)sin(\frac{\pi }{7})=cos(x - \frac{\pi }{7})$

$cos(x - \frac{\pi }{7}) =-\frac{\sqrt{2}}{2})$

we know ,

when $cos(x) =-\frac{\sqrt{2}}{2})$ then

$x = \frac{3\pi }{4} , \frac{5\pi }{4}$

For $cos(x - \frac{\pi }{7}) =-\frac{\sqrt{2}}{2})$

$x - \frac{\pi }{7}= \frac{3\pi }{4} and x - \frac{\pi }{7}= \frac{5\pi }{4}$

Add $\frac{\pi }{7}$ on both sides

$x= \frac{3\pi }{4} + \frac{\pi }{7} and x= \frac{5\pi }{4} +\frac{\pi }{7}$

Finally we add 2npi for general solution

So options C and D are correct

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3 years ago

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JulijaS [17]

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3 years ago

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Karolina [17]

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Step-by-step explanation:

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3 years ago

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Brums [2.3K]

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Aleksandr-060686 [28]

Answer:

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3 years ago