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sdas [7]
3 years ago
7

Can someone complete these questions and explain how thanks

Mathematics
1 answer:
Bond [772]3 years ago
3 0

Answer: 6259.9 cu. cm.

For 6)

Volume, V, for a cylinder:

generally V = A * h = πr^2h, therefore,

V1 = πr1^2h for the volume enclosed by C1

V2 = πr2^2h for the volume enclosed by C2

V = V1 - V2 for the volume of the solid, the tube.

V = π(r1^2 - r2^2)h

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melomori [17]

\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}

Actually Welcome to the Concept of the Volumes.

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3 years ago
I need to do this problem by completing the square . help please
sukhopar [10]

Answer:

the roots are n = 1 + √15 and n = 1 - √15

Step-by-step explanation:

In this case I would immediately rewrite n² - 2n - 5 = 10 as

n² - 2n                  = 10 + 5 = 15.

To complete the square:  Identify the coefficient of n (it is -2). Halve that, obtaining -1, square this result, and then add the outcome (1) to and subtract the outcome (1) to n² - 2n:

n² - 2n  <em>+ 1 - 1   </em>             = 15

Next, rewrite n² - 2n  + 1 as the square of a binomial:

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Finally, take the square root of both sides:

n - 1 = ±√15

so that the roots are n = 1 + √15 and n = 1 - √15

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