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3 years ago

R/3 = 7

Mathematics

2 answers:

dangina [55]3 years ago

7 0

R=21. 21/3=7. To check your answer, you can do 7x3 and it'll equal 21.

vampirchik [111]3 years ago

3 0

Are you just trying to isolate the r?

If so.... r/3 = 7
Multiply 3 on both sides to clear the denominator
3(r/3) = 7(3)
3 = 21

CHECK
21/3 = 7

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3 years ago

Can someone please help with this math question:)

Bingel [31]

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The rationalisation factor for $\frac{1}{ a - \sqrt{b} }$ is $a + \sqrt{b}$

So, let us apply it here.

$\frac{1}{5 - \sqrt{2} }$

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Therefore, multiplying and dividing by 5 + √2, we have

$= \frac{1}{5 - \sqrt{2} } \times \frac{5 + \sqrt{2} }{5 + \sqrt{2} } \\ = \frac{5 + \sqrt{2} }{(5 - \sqrt{2})(5 + \sqrt{2} ) } \\ = \frac{5 + \sqrt{2} }{ {(5)}^{2} - ( \sqrt{2})^{2} } \\ = \frac{5 + \sqrt{2} }{25 - 2} \\ = \frac{5 + \sqrt{2} }{23}$

Answer:

$\frac{5 + \sqrt{2} }{23}$

Hope you could understand.

If you have any query, feel free to ask.

5 0

2 years ago

Read 2 more answers

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Ann [662]

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It was answered correctly.

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3 years ago

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2 years ago

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3 years ago