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vova2212 [387]
3 years ago
9

Find the value of x and y. y=2x and 1.85x+3.7y=12.95

Mathematics
1 answer:
Len [333]3 years ago
3 0

Answer:

x=1.4 y=2.8

Step-by-step explanation:

Lets substitute y with 2x. We get: 1.85x+7.4x=12.95.

Simplifying by combining x: 9.25x=12.95

Then you just divide 12.95 by 9.25: x=1.4

Now for y. We know why is 2x so we just have to multiply x by 2: y=2x, y=2.8.

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A family goes grocery shopping every week. in a month the costs of the groceries are $72.42, $91.50, $58.99, and $69.02. 5. what
frozen [14]
1) Mean
The mean is given by the sum of the data divided by the number of data (4, in this case):
\mu =   \frac{1}{N} \sum x_i = \frac{1}{4}(72.42+91.50+58.99+69.02) = \frac{291.93}{4}=72.98 $

2) Standard deviation
The standard deviation is given by:
\sigma =  \sqrt{ \frac{1}{N} \sum (x_i-\mu)^2 }
where \mu is the mean, that we already found at point 1), and N=4. Substituting data, we have:
\sigma =  \sqrt{ \frac{1}{4} ((-0.56)^2+(18.52)^2+(-13.99)^2+(-3.96)^2) } =
= \sqrt{ \frac{1}{4}  (554.71)} = \sqrt{138.68} =11.78 $
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4 years ago
In the diagram below, BD is parallel to XY. what is the value of y?
melisa1 [442]

I can't see the diagram sorry.

Step-by-step explanation:

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8 0
3 years ago
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grandymaker [24]
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wrong solution would be B. x less then or equal to -5....because x is greater then or equal to -5


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Answer:

Step-by-step explanation:

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mojhsa [17]
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