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Dovator [93]
3 years ago
11

The sum of twice a number and 9 is 43

Mathematics
1 answer:
Irina-Kira [14]3 years ago
6 0
2x + 9 = 43 This is the equation.
2x = 34 Subtract 9 from both sides.
x = 17 Divide both sides by 2.
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Please help me out!!!!
Serggg [28]

Answer:

If you are trying to solve by substitution then you have 2 different possibilities of answer forms.

First Possibility:  (Point form)   (16,8)

Second Possibility: (equation form)  x=16, y=8

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7 0
3 years ago
How to calculate standard deviation given mean and sample size?
ad-work [718]
In addition to mean and sample size you will need the individual scores.

The formula for standard deviation is:

S^2 = E(X-M)^2/N-1

Here's an example: 
Data set: 4,4,3,1
Mean: 3
Sample size: 4

First, put the individual scores one after the other and subtract the mean from it.
4 - 3 = 1
4 - 3 = 1
3 - 3 = 0
1 - 3 = -2

Second, square the answers you got from step 1. 
1^2 = 1
1^2 = 1
0^2 = 0
-2^2 = 4
Third, plug the values from step 2 into the formula. 

S^2 = (1+1+0+4)/(4-1) = 6/3 = 2

Standard deviation = 2
3 0
3 years ago
42 is 96% of what number?
Law Incorporation [45]
Let, the number = x
It would be: x * 96% = 42
x * 0.96 = 42
x = 42 / 0.96
x = 43.75

In short, Your Answer would be 43.75

Hope this helps!
7 0
3 years ago
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It is the pythagorean theorem converse
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3 years ago
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Solve the equation 40=2x2+2x by factoring.
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Step-by-step explanation:

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