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3 years ago

8

A student says that the solution of 375=x -28 is 347. Explain the student error and find the correct answer

2 answers:

podryga [215]3 years ago

5 0

Answer:

x=403

Step-by-step explanation:

move all the terms that don't contain x to the right side and solve

aksik [14]3 years ago

4 0

Answer:

Explanation - instead of adding 28 to each side to get rid of the -28, the student subtracted 28 from each side

Correct Answer - x = 403

Step-by-step explanation:

The student subtracted 28 from each side instead of adding 28 to each side. When you add 28 to each side, you are adding 28 to -28, which makes it 0 and disappear. When you subtract 28 from each side, you are adding -28 to -28, which makes it -54, and not 0.

The correct answer can be found by adding 28 to each side, which gives us an answer of x = 403.

Hope this helps!! :)

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Answer:

Option (D)

Step-by-step explanation:

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By using the property of cyclic quadrilateral,

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The margin of error (E) is calculated as follows:

$E = z \times \sqrt{\frac{\sigma^2}{n}}$

So, we have:

$E = z \times \sqrt{\frac{3.2^2}{320}}$

$E = z \times \sqrt{\frac{10.24}{320}}$

The z-value for 90% confidence level is 1.645.

Substitute 1.645 for z

$E = 1.645 \times \sqrt{\frac{10.24}{320}}$

$E = 1.645 \times \sqrt{0.032}$

Take square roots

$E = 1.645 \times 0.1789$

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Approximate

$E = 0.29$

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Read more about margin of error at:

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