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Lena [83]
3 years ago
8

If w = -2 and v = -8, which of the following expressions shows the values correctly substituted in for the variables in the expr

ession w2 - v + 1?
(-2) 2 - (-8) + 1
(-2) 2 - (8) + 1
-2 2 - (-8) + 1
-2 2 - 8 + 1
Mathematics
2 answers:
Cloud [144]3 years ago
7 0
It’s A (-2) 2- (-8) + 1
ki77a [65]3 years ago
3 0

Answer:

the first one

(-2) 2-(-8)+1

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The life of light bulbs is distributed normally. The standard deviation of the lifetime is 15 hours and the mean lifetime of a b
Anastaziya [24]

Answer:

0.8413 = 84.13% probability of a bulb lasting for at most 605 hours.

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.

The standard deviation of the lifetime is 15 hours and the mean lifetime of a bulb is 590 hours.

This means that \sigma = 15, \mu = 590

Find the probability of a bulb lasting for at most 605 hours.

This is the pvalue of Z when X = 605. So

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

Z = \frac{605 - 590}{15}

Z = 1

Z = 1 has a pvalue of 0.8413

0.8413 = 84.13% probability of a bulb lasting for at most 605 hours.

7 0
3 years ago
Saby used a probability simulator to roll a 6-sided number cube and flip a coin 100 times. The results are shown in the tables b
Degger [83]
Short Answers
P(Both) = 0.1792
Givens
The total number of roles = 100
Total number of heads = 56
Number of times rolled a four =  32 [check this for me].

Set up the probabilities.
P(H) = 56/100
P(4) = 32/100
P(H)*P(4) = P(Both)

Substitute and solve
P(Both) = 56/100 * 32/100 = 1792/10000
P(Both) = 112/625 because there are many cancellations. Or you could just express it as 0.1972

8 0
3 years ago
Which option is a false statement about Christopher Columbus?
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4th one is defo right so it’s one of the rest
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Tatiana [17]

Answer:

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Step-by-step explanation:

7 0
4 years ago
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cluponka [151]

Answer:

which answer did you need help with

Step-by-step explanation:

i dont see what your inquiring about

8 0
4 years ago
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