Answer: Choice D
15(cos85° + i sin85°)
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Explanation:
Let's say we had these two general complex numbers, which are in polar form.

We can abbreviate them into the shorthand form

The notation "cis" stands for "cosine i sine".
Now that we have those complex numbers set up, multiplying them is as simple as saying this:

We do two basic things:
- Multiply the r values out front
- Add the theta values inside the the cis function
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With all that in mind, let's tackle the problem your teacher gave you.
The given complex numbers

abbreviate into

then those multiply to

which is why choice D is the final answer.
The answer is -7.2 and -36/5 hope this helps
Answer:
ok
Step-by-step explanation:
To simplify a ratio, whatever you do to the bottom, you must do to the top. Find the GCF of both numbers, then divide until you can no longer simplify. I showed my work on a sheet of paper for a visual look.
Answer:
$53.20
Step-by-step explanation:
First, you need to find 24% of $70.
Change the percent to a decimal.
24% to .24.
Multiply that times 70.
.24 x 70 = 16.8
This will be the amount of money taken off the original price, so you will subtract it from the $70.
70 - 16.8 = 53.2
Therefore, the retail price is $53.20