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Vilka [71]
3 years ago
5

Help i was sick and missed this lesson

Mathematics
1 answer:
AleksandrR [38]3 years ago
5 0
1.
x - 2y = -19
5x + 2y = 1 /+

6x = -18 / 6
x = -3

-3 - 2y = -19
-2y = -16. / ÷(-2)
y = 8


2.
3x + 4y = 18
-2x + 4y = 8 / ×(-1)

3x + 4y = 18
2x - 4y = -8 /+

5x = 10 / ÷5
x = 2

3 × 2 + 4y = 18
6 + 4y = 18 / -6
4y = 12 / ÷4
y = 3


3.
2x + y = 3
-x + 3y = -12 / ×2

2x + y = 3
-2x + 6y = -24 /+

7y = -21 / ÷7
y = -3

2x - 3 = 3 / +3
2x = 6 / ÷2
x = 3


Hit me up in comments if anything is unclear.
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Answer:

22.5 kilometers

Step-by-step explanation:

we know that

The scale drawing is

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That means

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or

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or

1 cm on a map represent 2,500 m in the actual

or

1 cm on a map represent 2,5 km in the actual

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3 years ago
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Answer: The answer for the question is: 1 5/8

Step-by-step explanation:

8 0
2 years ago
For a data set of the pulse rates for a sample of adult? females, the lowest pulse rate is 39 beats per? minute, the mean of the
Zarrin [17]

Answer:

a) The difference is of 35 beats per minute.

b) So 3.07 standard deviations below the mean.

c) Z = -3.07.

Step-by-step explanation:

Z-score:

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.

In this question:

Mean \mu = 74, standard deviation \sigma = 11.4

a. What is the difference between the pulse rate of 39 beats per minute and the mean pulse rate of the? females?

39 - 74 = -35

The difference is of 35 beats per minute.

b. How many standard deviations is that? [the difference found in part? (a)?

|Z| when X = 39. So

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

Z = \frac{39 - 74}{11.4}

Z = -3.07

|Z| = 3.07

So 3.07 standard deviations below the mean.

c. Convert the pulse rate of 39 beats per minutes to a z score.

From item b. above, Z = -3.07.

5 0
2 years ago
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kifflom [539]

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Both common stock and preferred stock have their advantages.

When considering which type may be suitable for you, it is important to assess your financial situation, time frame, and investment goals.

7 0
3 years ago
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