3 years ago

Please answer this question

Mathematics

1 answer:

Anarel [89]3 years ago

8 0

The answer is C. 4.1¯6

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Let z= -5 sqrt 3/2 + 5/2i and w=1 + sqrt 3i

MrRissso [65]

$z=-\dfrac{5\sqrt3}2+\dfrac52i=5\left(-\dfrac{\sqrt3}2+\dfrac12i\right)=5e^{i5\pi/6}$

$w=1+\sqrt3\,i=2\left(\dfrac12+\dfrac{\sqrt3}2i\right)=2e^{i\pi/3}$

b. Not exactly sure how DeMoivre's theorem is relevant, since it has to do with taking powers of complex numbers... At any rate, multiplying $z$ and $w$ is as simple as multiplying the moduli and adding the arguments:

$zw=5\cdot2e^{i(5\pi/6+\pi/3)}=10e^{i7\pi/6}$

c. Similar to (b), except now you divide the moduli and subtract the arguments:

$\dfrac zw=\dfrac52e^{i(5\pi/6-\pi/3)}=\dfrac52e^{i\pi/2}$

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3 years ago

What is a rational number between -1/4 and 2/5

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.20 is a rational number between -1/4 and 2/5.

It can be part of a ratio.

20:100

A fraction

20/100 or 1/5

I hope this helps!
~cupcake

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Answer:

Explanation:

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Step-by-step explanation:

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