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miskamm [114]
3 years ago
13

Estimate the solution to the system of equations. You can use the interactive graph below to find the solution.−3x+3y=9 2x−7y=−1

4 ​

Mathematics
1 answer:
hjlf3 years ago
5 0

Answer:

  (x, y) = (-1.4, 1.6)

Step-by-step explanation:

The graph shows the solution pretty clearly. It seems no estimation is required.

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Researchers measured the bone mineral desnsity of the spines of 94 women who had taken teh drug CEE. The mean was 1.016 g/cm2, a
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Answer:

The 95% confidence interval for the mean is between 0.985g/cm² and 1.047 g/cm².

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.025 = 0.975, so z = 1.96

Now, find M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

M = 1.96*\frac{0.155}{\sqrt{94}} = 0.0310

The lower end of the interval is the mean subtracted by M. So it is 1.016 - 0.0310 = 0.985 g/cm²

The upper end of the interval is the mean added to M. So it is 1.016 + 0.0310 = 1.047 g/cm²

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3 years ago
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Answer:

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Step-by-step explanation:

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If the sum of three consecutive terms of GP are k-4,k,k+5. Find k
labwork [276]

Answer:

k = 20

Step-by-step explanation:

t1 = a = k-4

a = k - 4

t2 = ar = k

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t3 = ar^2 = k + 5

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k^2/k-4 = k+5

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Answer:

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Step-by-step explanation:

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