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seropon [69]
2 years ago
13

Square root of -49 in terms of i

Mathematics
2 answers:
Vinil7 [7]2 years ago
7 0
It is -7i
Bye have a great days
katrin [286]2 years ago
5 0

Answer:

-7i

Step-by-step explanation:

7*7 = 49

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Please help answer and explanation im very confused.
Veseljchak [2.6K]

Answer:

1) 18m²

2) 25cm²

Step-by-step explanation:

1)

  • a = ½ × b × h
  • a = ½ × 9 × 4
  • a = ½ × 36
  • a = 18m²

2)

  • a = ½ × b × h
  • a = ½ × 10 × 5
  • a = 5 × 5
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2 years ago
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svetlana [45]
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3 years ago
A rectangle has length of (5x+2) and a width of (3x-1) with an area of 308 units squared. Find the perimeter
Alex777 [14]

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Step-by-step explanation:

5 0
3 years ago
Jimmy was supposed to multiply a certain number by 43 but by mistake he multiplied that number by 34 as a result his answer was
vredina [299]

Answer:

345

Step-by-step explanation:

We can solve this problem by two equations. Our variables will be the following:

x is the amount to be multiplied

and y is the amount that should be obtained by multiplying by 43

Thus our <u>first equation</u> is:

43x=y

But the problem tells us that there was an error and the number x was multiplied by 34, so the result failed by 3105, thus the <u>second equation</u> is as follows:

34x=y-3105

By multiplying the quantity by 34, an amount is obtained that differs from 3105 from what it would have been obtained if multiplied by 43.

Now we are going to <u>replace the first equation in the second one </u>(y=43x):

34x=43x-3105

And clear to find x:

3105=43x-34x\\3105=9x\\\frac{3105}{9}=x\\345=x

The number that jimmy was supposed to multiply by 43 is 345.

6 0
3 years ago
Who will have made more money at the
Mrac [35]
Rebecca will have made more money because she makes twice as much as mark and worked 6 more years than him
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1 year ago
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