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3 years ago

Which Expression is Equal to 7/√5

Mathematics

1 answer:

otez555 [7]3 years ago

7 0

Answer: $\frac{7\sqrt{5} }{5}$

Step-by-step explanation:

All you need do is to rationalize , that is :

$\frac{7}{\sqrt{5} }$ X $\frac{\sqrt{5} }{\sqrt{5} }$

= $\frac{7\sqrt{5} }{\sqrt{5} . \sqrt{5} }$

= $\frac{7\sqrt{5} }{5}$

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A cash register contains $10 bills and $20 bills with a total value of $520. If there are 32 bills total, then how many of each

ohaa [14]

12 is the number of $10 bills

20 is the number of $20 bills

Step-by-step explanation:

Hello,

Let's note

a the number of $10 bills

b the number of $20 bills

The total value is $520 so we can write the first equation (1)

$\boxed{\sf 10a \ + \ 20b \ = \ 520 }$

We know that there are 32 bills in total so we can write the second equation (2)

$\boxed{\sf a \ + \ b \ = \ 32 }$

(1) - 10*(2) gives

10a + 20b - 10(a+b) = 520 - 320 = 200

10a + 20b - 10a - 10b = 10b = 200

So b = 200/10=20

and then from (2) a = 32 - 20 = 12

Hope this helps.

Do not hesitate if you need further explanation.

Thank you

7 0

3 years ago

*HELP PLEASE* Will get BRAINLIEST answer!!!!

photoshop1234 [79]

When solving these proportions we just remember when moving a number from one side to the other if it started in the numerator it ends up in the denominator and vice versa.

I'll do it in two steps here for teaching purposes; it's not too hard to go directly to the answer.

$\dfrac{13}{7} = \dfrac{10}{v}$

$13 v = 7(10)$

$v= \dfrac{7 \cdot 10 }{13} = \dfrac{70}{13} \approx 5.4$

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3 years ago

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kolezko [41]

Step-by-step explanation:

$54,000,000 = 5.4 \times {10}^{7} \\$

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3 years ago

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JulsSmile [24]

If you add a zero to the end of .29 it becomes .290
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Nimfa-mama [501]

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3 years ago

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