Answer:
4.58
Step-by-step explanation:
21 is not a perfect square, but lies between the perfect squares 16 and 25. Thus, √21 lies between √16 and √25, that is, between 4 and 5. Since 21 is closer to 25 than to 16, √21 is closer to 5 than to 4. A rough estimate of √21 would be 4.7.
√21 done on a calculator comes out to 4.58.
Answer:
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Option B is correct.
Step-by-step explanation:
Paul was asked to use the elmination to find the solution to the system of linear equations

What are the missing steps in his work below?

So, the step missing is multiplying equation 1 by 2 i.e
![2\times [5x + 4y = 1] \\10x + 8y = 2](https://tex.z-dn.net/?f=2%5Ctimes%20%5B5x%20%2B%204y%20%3D%201%5D%20%5C%5C10x%20%2B%208y%20%3D%202)
So, Option B is correct.
Keywords: System of equations
Learn more about system of equations at:
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7.1-0.6=6.5 is the answer