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Svetlanka [38]
2 years ago
14

Hello, I'm Jordan and I have a question in math so Translate the following sentence into an equation, solve the equation. Then s

olve:
The sum of 5, 8, and a amounts to 20.
Mathematics
1 answer:
statuscvo [17]2 years ago
7 0

Answer:

<h3>lets create equation first then to solve it</h3>

.

Step-by-step explanation:

5+8+a=20

<h3>lets solve it.</h3>

5+8+a=20

13+a=20

a=20-13

a=7.

<h3>maybe it will be correct.</h3>
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Is y=7x+12 linear or nonlinear?
DiKsa [7]

Answer:

Yes, I think it is

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8 0
3 years ago
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Find equation of the line that contains the point (4,-2) and is perpendicular to the line y= _2x+8
xz_007 [3.2K]

Answer:

y = 1/2x - 4

Step-by-step explanation:

If two lines are perpendicular to each other, they have opposite slopes.

The first line is y = -2x + 8. Its slope is -2. A line perpendicular to this one will  have a slope of 1/2.

Plug this value (1/2) into your standard point-slope equation of y = mx + b.

y = 1/2x + b

To find b, we want to plug in a value that we know is on this line: in this case, it is (4, -2). Plug in the x and y values into the x and y of the standard equation.

-2 = 1/2(4) + b

To find b, multiply the slope and the input of x (4)

-2 = 2 + b

Now, subtract 2 from both sides to isolate b.

-4 = b

Plug this into your standard equation.

y = 1/2x - 4

This equation is perpendicular to your given equation (y = -2x + 8) and contains point (4, -2)

Hope this helps!

3 0
3 years ago
Read 2 more answers
a previous analysis of paper boxes showed that the standard deviation of the length is 9mm. What is the 98% confidence interval
il63 [147K]
We cannot calculate the confidence interval without the sample size.  However, for the second question, the sample size needed would be 49.

The formula we use is

n=(\frac{z_{\frac{\alpha}{2}}\times \sigma}{E})^2

To find the z-score:
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Subtract from 1:  1-0.01 = 0.99

Using a z-table (http://www.z-table.com) we see that this value is closest to a z-score of 2.33.

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6 0
3 years ago
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I believe it would be 54 dollars.

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Inessa05 [86]

Answer:

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6 0
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