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alexandr1967 [171]
3 years ago
7

HELPPP PLEASE!!

Mathematics
1 answer:
garik1379 [7]3 years ago
6 0
Im not for sure if i did this right but my calculator says that its 420.
hope i helped.
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Number expression for 84
Evgesh-ka [11]

Answer:

How do we get a bigger number? Subtracting or dividing will just make it smaller. So we have to multiply. We need it about 4 times bigger (3 x 28 = 84, 4 x 28 .

Step-by-step explanation:

7 0
3 years ago
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One more time what 4 + 4 × 4 + 4 ÷ 4=
katrin [286]

Answer:

should be 21

Step-by-step explanation:

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How to find next number in this sequence. 2,7,26,101,400?
lyudmila [28]
N(4)-1
n(4)-2

ex 2(4)=8
8-1=7

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28-2=26
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3 years ago
It takes 20 minutes to cut a log into 5 equal-size pieces. How long will it take to cut a similar log into 3 equal-size pieces
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30mins

Step-by-step explanation:

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3 years ago
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If (3-4i) (x+iy) = 3 root 5<br> show that x^2 + y^2=9/5
NNADVOKAT [17]

Answer:

the answer is 2 + i.

Step-by-step explanation:

Let the square root of 3 + 4i be x + iy.

So (x + iy) (x +iy) = 3 +4i

=> x^2 + xyi + xyi + i^2*y^2 = 3 + 4i

=> x^2 – y^2 + 2xyi = 3 + 4i

Equate the real and complex terms

=> x^2 - y^2 = 3 and 2xy = 4

2xy = 4

=> xy = 2

=> x = 2/y

Substitute in

=> x^2 - y^2 = 3

=> 4/y^2 - y^2 = 3

=> 4 – y^4 = 3y^2

=> y^4 + 3y^2 – 4 = 0

=> y^4 + 4y^2 – y^2 – 4 =0

=> y^2(y^2 + 4) – 1(y^2 + 4) =0

=> (y^2 – 1) (y^2 + 4) =0

Therefore y^2 = 1, we ignore y^2 = -4 as it gives complex values of y.

Therefore y = 1 and x = 2/1 = 2

The required square root of 3 + 4i is 2 + i.

5 0
3 years ago
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