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gayaneshka [121]
3 years ago
8

How do I solve this? Please show work, thank you.

Mathematics
1 answer:
irina [24]3 years ago
7 0

Answer:

a   x sqrt(7) - 49sqrt(x)

Step-by-step explanation:

sqrt(7x) [ sqrt(x) - 7sqrt(7)]

Distribute

sqrt(7x) *sqrt(x) - sqrt(7x)*7sqrt(7)

We know that sqrt(a) sqrt(b)= sqrt(ab)

sqrt(7x^2)  - 7sqrt(7^2 *x)

Now lets separate out the perfect squares

sqrt(7) *sqrt(x^2) - 7sqrt(7^2)*sqrt(x)

x sqrt(7) - 7*7sqrt(x)

x sqrt(7) - 49sqrt(x)

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Answer:

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Step-by-step explanation:

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3 years ago
Why are unbiased estimators preferred over biased estimators?
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Generally an unbiased statistic is preferred over a biased statistic. This is because there is a long run tendency of the biased statistic to under/over estimate the true value of the population parameter. Unbiasedness does not guarantee that an estimator will be close to the population parameter.

Step-by-step explanation:

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I need help again if I don't get this right then I'll have to do the lesson all over again and i'm already 10 lessons behind!
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