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Digiron [165]
3 years ago
10

If the difference of a number and four is doubled the result is 1/4 less than the number. find the number

Mathematics
1 answer:
sukhopar [10]3 years ago
8 0
The formula is  (2)(n-4) = n-1/4

Mult both sides by 4: 

                         8n - 32 = 4n -1, or 4n = 31, or n=31/4.

If this is not what you expected, please ensure that you have copied down the original problem correctly.  What do you mean by "1/4 less?"

Let's try    (2)(n-4) = 1n-(1/4)n = (3/4)n.  Then,

2n-8 = (3/4)n, or (5/4)n = 8.  Mult. both sides by (4/5), we get:

n = (5/4)(8) = 10.  Is that what you were hoping for?

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Lana71 [14]

Answer:

CV for A = 21.8%

CV for B = 15.5%

Step-by-step explanation:

The formula for coefficient of variation is:

CV = Standard Deviation / Mean

So,

For A:

Mean = Sum/No. of items

= 391300/14

=$27950

and

SD = $6085.31

CV for A = 6085.31/27950 * 100

=21.77%

Rounding off to one decimal

CV for A = 21.8%

For B:

Mean = Sum/No. of items

= 43.58/11

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6 0
3 years ago
A bracelet is exactly 6.97 cm across from one side to the other, through the center. What is the approximate area of the bracele
Vadim26 [7]

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≈ 38.14 cm²

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Area of circle = ?

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What is the missing value?<br> 54<br> 30%<br> 100% <br> ?
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Maru [420]
C. 6

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Point B is the center of a circle, and AC is a diameter of the circle. Point D is a point on the circle different from A and C.
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