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3 years ago

What is a number that when you multiply it by 8 and subtract 12 from the product, you get 76?

Mathematics

1 answer:

Dmitry [639]3 years ago

3 0

Answer:

Step-by-step explanation:

Equation: 8x - 12 = 76

Add 12 to both sides

8x = 88

Divide both sides by 8

x = 11

Hope this helped :)

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Can someone please help me I’m stuck

olga_2 [115]

Answer:

Step-by-step explanation:

You have to do base x height divided by 2

50/2

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3 years ago

Find the standard deviation of 21, 31, 26, 24, 28, 26

Vesnalui [34]

Given the dataset

$x = \{21,\ 31,\ 26,\ 24,\ 28,\ 26\}$

We start by computing the average:

$\overline{x} = \dfrac{21+31+26+24+28+26}{6}=\dfrac{156}{6}=26$

We compute the difference bewteen each element and the average:

$x-\overline{x} = \{-6,\ 5,\ 0,\ -2,\ 2,\ 0\}$

We square those differences:

$(x-\overline{x})^2 = \{36,\ 25,\ 0,\ 4,\ 4,\ 0\}$

And take the average of those squared differences: we sum them

$\displaystyle \sum_{i=1}^n (x-\overline{x})^2=36+25+4+4+0+0=69$

And we divide by the number of elements:

$\displaystyle \sigma^2=\dfrac{\sum_{i=1}^n (x-\overline{x})^2}{n} = \dfrac{69}{6} = 11.5$

Finally, we take the square root of this quantity and we have the standard deviation:

$\displaystyle\sigma = \sqrt{\dfrac{\sum_{i=1}^n (x-\overline{x})^2}{n}} = \sqrt{11.5}\approx 3.39$

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3 years ago

11+3(2x-1) = 20 -- x

attashe74 [19]

Answer:

x=3.50

Step-by-step explanation:

2*3.50=7

7-1=6

3+6=9

9+11=20

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3 years ago

If 25% more than a number is 325 what is 20% less than the number

Verdich [7]

Let the number be x. Then 1.25x = 325, or x = 260.

20% less than 260 is 0.80(260) = 208

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3 years ago

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Korolek [52]

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3 years ago