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d1i1m1o1n [39]
2 years ago
12

Help me plz this is my last chance to get it correct (B is the wrong answer btw)

Mathematics
1 answer:
cricket20 [7]2 years ago
8 0

Answer: I would think D.

Step-by-step explanation: I'm worried for you, I hope this is correct.

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WILL MARK BRAINLIEST!!! Find the fifth roots of 243(cos 240° + i sin 240°).
Snowcat [4.5K]

Answer:

<h2>3(cos 336 + i sin 336)</h2>

Step-by-step explanation:

Fifth root of 243 = 3,

Suppose r( cos Ф + i sinФ) is the fifth root of 243(cos 240 + i sin 240),

then r^5( cos  Ф  + i sin  Ф )^5 = 243(cos 240 + i sin 240).

Equating equal parts and using de Moivre's theorem:

r^5 =243  and  cos  5Ф  + i sin  5Ф = cos 240 + i sin 240

r = 3 and  5Ф = 240 +360p so Ф =  48 + 72p

So Ф = 48, 120, 192, 264, 336  for   48 ≤ Ф < 360

So there are 5 distinct solutions given by:

3(cos 48 + i sin 48),

3(cos 120 + i sin 120),

3(cos 192 + i sin 192),

3(cos 264 + i sin 264),

3(cos 336 + i sin 336)

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2 years ago
How do i get a better grade if i'm failing
stellarik [79]
Ask for extra credit.

4 0
3 years ago
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If y is directly proportional to x and y = 17.5 when x=21 find y when x=39
morpeh [17]

direct proportion y=kx , k is constant and k does not equal to 0.

17.5=k(21)

k=5/6

when x =39

y=5/6 ×39

y=32.5

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2 years ago
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A dress which costs $180 is being sold at a discount of 10%. The amount of the discount is
ehidna [41]

Answer:

The discount is $18

Step-by-step explanation:

6 0
3 years ago
Please help me!! i have no clue what i am doing on this one.
Sonja [21]

Answer:

yr answer is G. 21

<h2>stay safe healthy and happy<u>.</u><u>.</u></h2>

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2 years ago
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