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Pani-rosa [81]
3 years ago
6

Stodoła składa się z 1259 cegieł. Druga stodoła ma o 347 cegieł mniej. Trzecia ma o 567 cegieł więcej od pierwszej stodoły a czw

arta stodoła ma o 490 cegieł więcej niż druga stodoła. Z ilu cegieł składa się druga, trzecia i czwarta stodoła
Mathematics
1 answer:
mel-nik [20]3 years ago
8 0

Answer:

Second barn: 912 bricks

Third barn: 1826 bricks

Fourth barn: 1402 bricks

Step-by-step explanation:

(English question: The barn consists of 1259 bricks. The second barn has 347 bricks less. The third has 567 bricks more than the first barn and the fourth barn has 490 bricks more than the second barn. How many bricks consists of the second, third and fourth barn.)

If the second barn has 347 bricks less than the first barn, so the second barn has:

1259 - 347 = 912 bricks

The third barn has 567 bricks more than the first barn, so the third barn has:

1259 + 567 = 1826 bricks

The fourth barn has 490 bricks more than the second barn, so the fourth barn has:

912 + 490 = 1402 bricks

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3 years ago
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The line through (5, 7) and (1, - 5)
lbvjy [14]

Answer:

Hey there!

Slope of the line: \frac{y2-y1}{x2-x1}

Slope of the line: \frac{12}{4}, which is equal to 3.

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Point slope form: y-7=3(x-5)

Y intercept form: y-7=3x-15

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3 years ago
Jack read 9 books in 15 months. What was his rate of reading in months per book? Include units.
sladkih [1.3K]

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3/5 books

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7 0
2 years ago
How come this person didn’t divide EVERYTHING on the left by 2? I thought you had to...
damaskus [11]

The short answer is that algebra doesn't work that way. You wouldn't divide *everything* by 2, but every term that contains a factor of 2.

In the expression

2 (6<em>x</em> - 1) + 2 (2<em>x</em> + 5)

both terms have a factor of 2 (the 2 out in front of them). They're the ones that get canceled when dividing by 2:

(2 (6<em>x</em> - 1) + 2 (2<em>x</em> + 5)) / 2 = 2/2 (6<em>x</em> - 1) + 2/2 (2<em>x</em> - 5)

… = 1 (6<em>x</em> - 1) + 1 (2<em>x</em> - 5)

… = (6<em>x</em> - 1) + (2<em>x</em> - 5)

and so on.

Looking ahead, it turns out that the equation is solved by <em>x</em> = 7. This makes 6<em>x</em> - 1 = 41 and 2<em>x</em> + 5 = 19. So the equation is saying that, if you make these replacements,

2×41 + 2×19 = 120

If you divide *everything* on the left by 2, you end up with fractions:

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but 41 + 19 = 60, so the end result would be 30, but that's not the same as 120/2 = 60.

5 0
3 years ago
Which of the following statements about the percentiles for the standard normal distribution are correct? A. The 90th percentile
shutvik [7]

Answer:

Correct option: (C) The 75th percentile is approximately 0.67

Step-by-step explanation:

The <em>p</em>th percentile is a data value such that at least <em>p</em>% of the data set is less than or equal to this data value and at least (100 - <em>p</em>)% of the data set are more than or equal to this data value.

If <em>x</em> is the <em>p</em>th percentile of a data set then,

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        P (Z < z) = 0.90, then <em>z</em> = 1.28

  • The 10th percentile of a standard normal distribution is:

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  • The 75th percentile of a standard normal distribution is:

        P (Z < z) = 0.75, then <em>z</em> = 0.67

  • The 15th percentile of a standard normal distribution is:

        P (Z < z) = 0.15, then <em>z</em> = -1.04

Thus, the correct statement is (C).

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