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3 years ago

:)Merry christmas eve may you guys please help me with this :)

Mathematics

2 answers:

nata0808 [166]3 years ago

7 0

It’s 4 trust me
I just looked it up to make sure

Mariana [72]3 years ago

6 0

the answer is to this is c

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$i^5+i^{-25}+i^{45}$<img src="https://tex.z-dn.net/?f=%24i%5E5%2Bi%5E%7B-25%7D%2Bi%5E%7B45%7D%24" id="TexFormula1" title="$i^5+i

gregori [183]

$i^5+i^{-25}+i^{45}$

Rewrite the term $i^{-25}$

$=i^5+\dfrac{1}{i^{25}}+i^{45}$

Expand each term so we have

$=i(i^2)^2+\dfrac{1}{i(i^2)^{12}}+i(i^2)^{22}$

Use the fact that $i^2=-1$

$=i(-1)^2+\dfrac{1}{i(-1)^{12}}+i(-1)^{22}$

Use the fact that $(-1)^{a}=1$ when a is an even number

$=i+\dfrac{1}{i}+i$

Simplify

$=i-i+i$

$=i$

Let me know if you need any clarifications, thanks!

3 0

3 years ago

Read 2 more answers

There are 18 people waiting for the train. Eight-ninths of them have an umbrella. How many people waiting for the train have an

Pie

Answer:

Step-by-step explanation:

Ok, so there are 18 people. If 8/9 have umbrellas, how many have umbrellas?

There is a simple solution to this.

First, lets find out how much people is 1/9

We can do this by dividing 18 by 9 to get 2

So 1/9 of the group is 2 people.

Now you can use this to find 8/9 by multiplying 2 by 8

This gives you the total of 16

Another way you could do this was take the answer from the first step and subtract that from the 18

9/9 - 1/9 = 8/9 => 18 - 2 = 16

Hope this helps! =)

4 0

3 years ago

Match each expression on its left to its product

maw [93]

Answer:

there is no expression to look at. you forgot to put a picture

Step-by-step explanation:

add a picture next time!

5 0

3 years ago

I will give Brainleist

Zepler [3.9K]

Answer: 12y + 11

Step-by-step explanation:

12 x y + 11

8 0

3 years ago

PLS HELP ASAP 3 MORE QUESTIONS I NEED HELP WITH BUT I CAN ONLY GO 1 BY 1

Genrish500 [490]

Answer:

I DONT KNOW THE ANSRWE EITHERAAAA

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3 years ago