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mixer [17]
1 year ago
14

12-6r=2r+36 (2-step equations)

Mathematics
2 answers:
mart [117]1 year ago
5 0

Answer: r=-3

Step-by-step explanation:

12-6r=2r+36

12=8r+36

-24=8r

r=-3

ad-work [718]1 year ago
3 0
The answer is -3.

Explation:

12-6r=2r+36
+6r +6r
———————
12=8r+36
-36 -36

-24=8r
then divide each side by 8 so you then get r= -3 as you’re answer.
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A study of drive-thru wait times for fast-food restaurants found that the average time spent Wendy's drive-thru was 138.5 second
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Answer:

207.72 seconds.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score 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 p-value, we get the probability that the value of the measure is greater than X.

Mean waiting time of 138.5 seconds, standard deviation of 29 seconds.

This means that \mu = 138.5, \sigma = 29

The length of time the owner should choose so that only 0.75% of customers get a free Frosty i.e. only 0.75% wait longer than

The 100 - 0.75 = 99.15th percentile, which is X when Z has a pvalue of 0.9915, so X when Z = 2.387.

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

2.387 = \frac{X - 138.5}{29}

X - 138.5 = 2.387*29

X = 207.72

So the answer is 207.72 seconds.

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3 years ago
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Answer:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

8 0
2 years ago
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