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Norma-Jean [14]
3 years ago
14

Identify the number of solutions or zeros 2x^2+5x-9=0

Mathematics
1 answer:
Anon25 [30]3 years ago
6 0
There are going to be two solutions because the "biggest" x is x^2 but you can factor to find what they actually are.

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Suppose the length of telephone calls form a normal distribution with a mean length of 8.0 min and a standard deviation of 2.5 m
ikadub [295]

Answer:

(A) 0.0013

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 = 2.5

The probability that telephone call selected a random will last more than 15.5 min is most nearly

This is 1 subtracted by the pvalue of Z when X = 15.5.

So

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

Z = \frac{15.5 - 8}{2.5}

Z = 3

Z = 3 has a pvalue of 0.9987

1 - 0.9987 = 0.0013

So the correct answer is:

(A) 0.0013

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3 years ago
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alexira [117]

Answer:

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Step-by-step explanation:

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Answer:

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What is equivalent to 3x-4y=6
Andreyy89

Answer:

y= (3/4) x - (3/2)

Step-by-step explanation:

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Answer: 2x

Step-by-step explanation: hope this helps :)

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