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nignag [31]
3 years ago
5

The equation of a linear function in point-slope form is y – y1 = m(x – x1). Harold correctly wrote the equation y = 3(x – 7) us

ing a point and the slope. Which point did Harold use? When Harold wrote his equation, the point he used was (7, 3). When Harold wrote his equation, the point he used was (0, 7). When Harold wrote his equation, the point he used was (7, 0). When Harold wrote his equation, the point he used was (3, 7).
Mathematics
2 answers:
xz_007 [3.2K]3 years ago
8 0

For this case we must find the point that Harold used to arrive at the following equation:

y = 3 (x-7)

Starting from the fact that the equation of the point-slope form of a line is given by:

(y-y_ {1}) = m (x-x_ {1})

If we compare the standard equation with Harold's, we see that the slope of the line is m = 3.

In addition, it is observed that x_ {1} = 7and y_ {1} = 0.

Then, the correct option is: Harold used the point (7,0)

ANswer:

When Harold wrote his equation, the point was used (7,0).

Kamila [148]3 years ago
8 0

Answer:

c

Step-by-step explanation:

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3 years ago
In a sample of 1000 cases, the mean of a certain test is 14 and the standard deviation is 2.5. Assume the distribution to be nor
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Answer:

The top 20% of the students will score at least 2.1 points above the mean.

Step-by-step explanation:

When the distribution is normal, we use 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.

The mean of a certain test is 14 and the standard deviation is 2.5.

This means that \mu = 14, \sigma = 2.5

The top 20% of the students will score how many points above the mean

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The top 20% of the students will score at least 2.1 points above the mean.

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3 years ago
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