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qaws [65]
3 years ago
11

The difference of the square of a number and 4 is equal to 3 times that number. Find the positive solution.

Mathematics
2 answers:
liberstina [14]3 years ago
8 0

Let the number be 'a':

The difference of the square of a number and 4

a^2 -4

is equal to 3 times that number.

= 3*a

a^2 -4 =3a

a^2 -3a -4=0

(a-4) (a+1)=0

solutions are: 4 and -1

aleksandr82 [10.1K]3 years ago
3 0

Step-by-step explanation:

1-4 just did this\

:D

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There has been much media coverage of the high cost of medicinal drugs in the United States. One concern is the large variation
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Data for the question :

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Answer:

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Variance = 29.46

Standard deviation = 5.43

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Step-by-step explanation:

The range of the data :

Maximum - Minimum.

121.2 - 95.35 = 25.35

The variance, s :

s² = Σ(X - m²) / n - 1

Mean, m = Σx / n

X = individual data point

m = mean of data

n = sample size

Using a calculator of save time and ensure accuracy :

s² = 29.45522

The standard deviation, s

s = sqrt(variance)

s = sqrt(s²)

s = sqrt(29.45522)

s = 5.42726.

The range, variance and standard deviation, all measure the degree of variation in a dataset. The values of these statistical measure obtain for the price of 1 product across different pharmaceutical stores, suggests thatvthe variation in price is high;

With a range of about 25.35 and standard deviation of 5.43

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