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adell [148]
3 years ago
12

Please help this is including substitution and system of equations.

Mathematics
1 answer:
Darina [25.2K]3 years ago
6 0

Answer: I gotcha

Step-by-step explanation:

B, C, C, D, B

I just helped my brother with this

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I have the answer but I have to show work help?
Marina86 [1]
See attached picture for steps

4 0
3 years ago
Suppose that the scores of a history test are normally distributed with a mean of 565 and a standard deviation of 113. a) What p
zvonat [6]

Answer:

15.39% of the scores are less than 450

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 = 565, \sigma = 113

What percentage of the scores are less than 450?

This is the pvalue of Z when X = 450. So

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

Z = \frac{450 - 565}{113}

Z = -1.02

Z = -1.02 has a pvalue of 0.1539

15.39% of the scores are less than 450

6 0
3 years ago
Which property does the equation illustrate?<br> 0 +-b= -b?
konstantin123 [22]

Answer:

The property the equation illustrates would be the zero property of addition.

Step-by-step explanation:

The additive property of zero states that when you have any number and add zero to it, your answer will always equal the original number.

8 0
3 years ago
Please help! It's a final!!
Svetach [21]

Answer:

BBBBBBBBBB

Step-by-step explanation:

yeah if you add 2 without parenthesis it goes up

6 0
3 years ago
of the last 15 contestants on a game show, 3 won a prize. Considering this data, how many of the next 20 contestants would you e
nadya68 [22]
You do 3/15 which is 0.2

then 0.2*20 which is 4

you can expect 4 to win a prize

hope this helps and you rate me good;)
4 0
3 years ago
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