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3 years ago

I need this question for unit test

Mathematics

1 answer:

krek1111 [17]3 years ago

3 0

The answer is this:
A. (6,3)

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Calculate the value of 36²-27²

storchak [24]

567 is the answer to your question

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3 years ago

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The length of a rectangular field is 6 metres longer than its width. If the area of the field is 72 square metres, What are the

True [87]

Answer:

Let's call the length of the field "l", and the width of the field "w".

If the area of the field is 72 square meters, then we have:

l x w = 72

And if the length is 6 meters longer than the width, we have:

l = w+6

So looking at the first equation (l x w = 72), we can substitute the l for a w+6.

And we obtain:

(w+6) x (w) = 72

Which simplifies to w^2 + 6w = 72.

This quadratic equation is pretty easy to solve, you just need to factor it.

w^2 + 6w - 72 = 0

(w-6)(w+12)

This leaves the roots of the quadratic equation to be 6 and -12, but in this case, a width of -12 wouldn't make sense.

So, the width of the rectangular field is 6, and the length of the field is 12.

Let me know if this helps!

5 0

3 years ago

Select the correct answer.

vagabundo [1.1K]

B
Explanation sksnsnsnnsmams

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3 years ago

Help..... pls........

Serga [27]

Answer:

2/9 is the probability.

Step-by-step explanation:

Hope's this helps.

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3 years ago

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Scores for a common standardized college aptitude test are normally distributed with a mean of 493 and a standard deviation of 9

Tomtit [17]

Answer:

34.01% probability that his score is at least 532.1.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 493, \sigma = 95$