When solving this system of linear equations with the elimination method, you can multiply the bottom equation by 3.
2 answers:
Answer: The correct option is A.
Explanation:
The system of equations is,
When solving this system of linear equations with the elimination method, we can multiply the bottom equation by 3.
This step works because according to the multiplication property of equality,
If,
... (1)
Multiplied both side by m then,
..... (2)
Then (1) and (2) are equivalent equations.
So, by multiplication property of equality, the second equation can be multiply by 3.
Therefore, he correct option is A.
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Answer:
The <u>sample proportion</u>, denoted by ^p, is given by the formula ^p= , where x is the number of individuals with a specified characteristic in a sample of n individuals.
Step-by-step explanation:
Sample proportion is used to determine sample mean, sample standard error and test the hypotheses about the population.
<em>sample mean</em> can be stated as p and <em>sample standard error</em> can be found using the equation where
- n is the sample size
- p is the sample proportion
And if n×p×(1-p)≥10, then sample is assumed large enough to assume normal distribution and apply statistical test.