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ahrayia [7]
3 years ago
6

One eighth of a number ,increased by 20, is 32.Find the number

Mathematics
1 answer:
Paha777 [63]3 years ago
7 0
X - the number

\frac{1}{8} x +20=32 \\
\frac{1}{8}x=32-20 \\
\frac{1}{8}x=12 \\
x=12 \times 8 \\
x=96

The number is 96.
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3 years ago
The head of the Westlane Cultural Center wants to get a sense of how quickly pledges from donors arrive at the center. It takes
Rzqust [24]

Answer:

95.64% probability that pledges are received within 40 days

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 = 28, \sigma = 7

What is the probability that pledges are received within 40 days

This is the pvalue of Z when X = 40. So

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

Z = \frac{40 - 28}{7}

Z = 1.71

Z = 1.71 has a pvalue of 0.9564

95.64% probability that pledges are received within 40 days

7 0
3 years ago
Evaluate c-2c−2c, minus, 2 when c=7c=7c, equals, 7.
____ [38]

Answer:

the correct answer would be 5

Step-by-step explanation:

when c=7, then we put that value in for c in the equation c-2

c-2

(7)-2

5

3 0
3 years ago
Photo attached. 15 points!
notka56 [123]

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3 years ago
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