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3 years ago

13

Hey, can someone please help me with this? I’m pretty sure part A is .5 or 50%. But I can not figure out part B. Can someone ple

ase give their opinion?
Thank you

1 answer:

Illusion [34]3 years ago

7 0

Answer:

I myself aren't sure but I did caculations and i think your correct

Step-by-step explanation:

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Convert the complex number z = -12 + 5i from rectangular form to polar form.

Paha777 [63]

Answer:

$z=13(\cos 157\degree +i\sin157\degree)$

Step-by-step explanation:

The given complex number is

$z=-12+5i$

The polar form of this complex number is;

$z=r(\cos \theta +i\sin \theta)$ , where

$r=\sqrt{(-12)^2+5^2}$

$r=\sqrt{144+25}=\sqrt{169}=13$

and

$\theta =\tan^{-1}(\frac{5}{-12})$

This implies that;

$\theta=157\degree$ to the nearest degree.

Hence the polar form is

$z=13(\cos 157\degree +i\sin157\degree)$

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4 years ago

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3 years ago

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seraphim [82]

Answer:

C. 325.

Step-by-step explanation:

The last term a5 = 85

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= (5/2)(45 + 85)

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= 325.

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