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Natasha2012 [34]
3 years ago
15

Need help with step by step explanation pls

Mathematics
1 answer:
sesenic [268]3 years ago
5 0

Answer:

5 \sqrt{2}

Step-by-step explanation:

\sqrt{50}  -  \sqrt{32}  + 2 \sqrt{8}  \\ 5 \sqrt{2}  - 4 \sqrt{2}  + 4 \sqrt{2}  \\  \sqrt{2}  + 4 \sqrt{2} \\ 5 \sqrt{2}

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Write and evaluate the definite integral that represents the volume of the solid formed by revolving the region about the x-axis
guapka [62]

Answer: V = \frac{64}{3}\pi

Step-by-step explanation: A solid formed by revolving the region about the x-axis can be considered to have a thin vertical strip with thickness Δx and height y = f(x). The strip creates a circular disk with volume:

V = \pi. y^{2}.Δx

Using the <u>Disc</u> <u>Method</u>, it is possible to calculate all the volume of these strips, giving the volume of the revolved solid:

V = \int\limits^a_b {\pi. y^{2} } \, dx

Then, for the region generated by  y = - x + 4:

V = \int\limits^4_0 {\pi.(-x+4)^{2} } \, dx

V = \pi.\int\limits^4_0 {(x^{2}-8x+16)} \, dx

V = \pi.(\frac{x^{3}}{3}-4x^{2}+16x )

V = \pi.(\frac{4^{3}}{3}-4.4^{2}+16.4 - 0 )

V = \frac{64}{3}.\pi

The volume of the revolved region is V = \frac{64}{3}.\pi

8 0
3 years ago
Abe is buying wrapping paper.
fenix001 [56]

Answer:

So you need to compute all the rates to see which is the best deal.

$1.79/12.5ft^2=$0.1432 per ft^2

$5.29/40ft^2=$0.13225 per ft^2

$8.49/50ft^2=$0.1698 per ft^2

$6/60ft^2=$0.10 per ft^2

So the last option is the cheapes per square foot and thus is the best deal.  Ordered from least to greatest.

Sherbert, blue, red, and green

Step-by-step explanation:

hope this helps

4 0
3 years ago
Read 2 more answers
(-3,8) (2, - 11)
lesya692 [45]
Not sure what your asking here
4 0
3 years ago
Help me please thank you!!
Alexxandr [17]

The answer to your problem is A because you must add them altogether but i might be wrong im just trying to help you out

5 0
3 years ago
Help please I do t have lot of time
lys-0071 [83]
It’s b my good friend
4 0
3 years ago
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