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Makovka662 [10]
4 years ago
10

Evaluate 8x - 3 + y If x = 2 and y = 1

Mathematics
2 answers:
AURORKA [14]4 years ago
8 0

Answer:

14

Step-by-step explanation:

8x - 3 + y

Let x=2 and y=1

8*2 -3 +1

16 -3+1

14

Yuki888 [10]4 years ago
5 0
14

To solve this, you have to substitue 2 for x and 1 for y (x=2 and y=1).

8x (the same thing as 8 times x) equals 16 because 8 times 2 equals 16.

16 - 3 = 13

You now want to add 13 + y. Y = 1, so you are adding 13 + 1, which is 14.

8(2) - 3 + 1 = 14
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Step-by-step explanation:

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Suppose the life of a particular brand of laptop battery is normally distributed with a mean of 8 hours and a standard deviation
Ierofanga [76]

Answer:

4.75% probability that the battery will last more than 9 hours before running out of power

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 = 8, \sigma = 0.6

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This is 1 subtracted by the pvalue of Z when X = 9. So

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

Z = \frac{9 - 8}{0.6}

Z = 1.67

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4 0
3 years ago
A person who is 68in tall casts a shadow that is 54in long. At the same moment, a tree casts a shadow that is 18ft long. What is
34kurt

Answer:

<u>22.67 ft</u> is the height of tree.

Step-by-step explanation:

Given:

Height of a person is 68 in and casts a shadow that is 54 in long.

At the same point, a tree casts a shadow that is 18 ft long.

Now, to find the height of tree.

Let the height of tree be x.

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So, 68 in is equivalent to 54 in.

Thus, x is equivalent to 18 ft.

Now, to get the height of tree by using cross multiplication method:

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<em />1224=54x<em />

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