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olya-2409 [2.1K]
3 years ago
6

Please explain this answer ☹️

Mathematics
1 answer:
GuDViN [60]3 years ago
7 0

Answer:

see explanation

Step-by-step explanation:

Note that cos315° = cos45° and sin315° = - sin45° and

cos45° = sin45° = \frac{1}{\sqrt{2} } = \frac{\sqrt{2} }{2}

Hence

12(cos315° + isin315°)

= 12(cos45° - isin45°)

= 12(\frac{\sqrt{2} }{2} - i \frac{\sqrt{2} }{2})

= 6\sqrt{2} - 6i \sqrt{2}

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The sum of two numbers is 72 while the difference between the numbers is 25. the larger of the numbers is
7nadin3 [17]
2 equations:  the first one is the sum of 2 unknown numbers x and y: x + y = 72. Now the difference is 25, so x - y = 25. Solve the first equation for y: y = 72 - x. Sub that into the second equation to solve for x: x - (72 - x) = 25. x - 72 + x = 25 and 2x - 72 = 25.  Therefore, 2x = 97 and x = 48.5  That's the larger of the 2 numbers; since we subtracted y from x we defined x as the larger of the 2.  Just for fun, plug x in to find that y = 23.5
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3 years ago
Which is equivalent to 3sqrt8^1/4x
fiasKO [112]

Answer:

12 √8 ×

Step-by-step explanation:

There is two many variables in that I believe you meant. What is equivalent to 3 square root 8^1/4x? =12 √8 × . Hopefully this helped you .

3 0
3 years ago
Mr. Allen is planning a twenty question quiz worth 100 points. The quiz will contain True/False questions worth 3 points each an
andrey2020 [161]

Answer:

a)5 b)15

Step-by-step explanation:

5 times 11=55

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5+15 is 20 questions

4 0
3 years ago
Read 2 more answers
Please help me!!!!! :)
dsp73
To find the volume,we would first need to find the height of square pyramid, by it's base edge and slant height using Pythagoras theorem:

{height }^{2}  = {13}^{2}  -  {10}^{2}  \\ {height }^{2}  = 69 \\ height =   \sqrt{69}

We can then use the pyramid formula to find the volume:
base \:  \times  \: height \:  \times  \frac{1}{3}

In this case,the volume will be:

10×_/69×1/3
=27.68874...
≈27.7 units^3

Hope it helps!
5 0
3 years ago
No links please i cant seem to find the answer for this qn
Rudiy27

Answer:

(a) is 15

(b) is 30

75 divide by 15 times 90 divide by 15 is 30

6 0
3 years ago
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