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Molodets [167]
3 years ago
12

Find the volume V of the solid obtained by rotating the region bounded by the given curves about the specified line.

Mathematics
1 answer:
faltersainse [42]3 years ago
3 0

Answer:

V = 34,13*π   cubic units

Step-by-step explanation: See Annex

We find the common points of the two curves, solving the system of equations:

y²  = 2*x                           x = 2*y  ⇒  y = x/2

(x/2)² = 2*x

x²/4 = 2*x

x  =  2*4         x  = 8      and   y = 8/2       y = 4

Then point  P ( 8 ;  4 )

The other point Q is  Q ( 0; 0)

From these  two points, we get the integration limits for dy ( 0 , 4 )are the integration limits.

Now with the help of geogebra we have: In the annex segment ABCD is dy then

V = π *∫₀⁴ (R² - r² ) *dy   =  π *∫₀⁴ (2*y)² - (y²/2)² dy =  π * ∫₀⁴ [(4y²) - y⁴/4 ] dy

V = π * [(4/3)y³ - (1/20)y⁵] |₀⁴

V =  π * [ (4/3)*4³ - 0 - 1/20)*1024 + 0 )

V = π * [256/3  - 51,20]

V = 34,13*π   cubic units

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The length of a log of wood is 90 in. How many cuts do you need to make to obtain
Ilia_Sergeevich [38]

The greatest number of pieces will be 12 where each piece will have a different length and the length of each piece is a whole number, in inches and the remaining piece length will be 12 in(90 - 78).

<h3>What is a sequence?</h3>

It is defined as the systematic way of representing the data that follows a certain rule of arithmetic.

The total length of the wood = 90 in

We have to cut it into the greatest number of pieces, where each piece will have a different length and the length of each piece is a whole number, in inches.

We can cut it like:

1 in, 2 in, 3 in, 4 in, and so on

The above shows the arithmetic sequence,

The sum of the n natural number is given by:

\rm S_n = \dfrac{n(n+1)}{2}

\rm 90 = \dfrac{n(n+1)}{2}

After solving, we will get a quadratic equation:

n² + n -180 = 0

After solving, we will get:

n = 12.92 and n = -13.92(term can not be negative)

n = 12 (taking whole number)

Thus, the greatest number of pieces will be 12 where each piece will have a different length and the length of each piece is a whole number, in inches and the remaining piece length will be 12 in(90 - 78).

Learn more about the sequence here:

brainly.com/question/21961097

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6 0
2 years ago
Water freezes at 32°F <br><br> Write an inequality for all temperatures that water is NOT frozen
aleksandrvk [35]

Answer:

33<x for not being frozen water

Step-by-step explanation:

3 0
3 years ago
What is -x-3y=-3 and 2x+3y=5 using elimination method?
xxTIMURxx [149]

Answer:(2,1/3)


Step-by-step explanation:

-x-3y=-3

2x+3y=5


_________First solve for x since y is 0. -3y+3y=0

1X = 2

1x/1= 2/1

X= 2

Now substitute your x answer into any equation to find y I used second equation

2x+3y= 5

2(2)+3y=5

4+3y=5

3y=5-4

3y=1

3y/3=1/3

Y=1/3



6 0
3 years ago
Miya currently makes $7.00 per hour working as a babysitter for her neighbors. She is trying to work extra
Katena32 [7]

Answer:

1st option

Step-by-step explanation:

turn 15% into a decimal:

%15 -> 0.15

multiply $7 by 0.15 then add together:

7 x 0.15 = 1.05

$7 + $1.05 = $8.05

20 hours x $8.05 hour = $161

$161 x 10 weeks = $1610 total by the end of summer

<em>the question does not say how many hours she works normally so the answer might be off...</em>

if she continued with $7, assuming she works 20 hours/week:

20 hours x $7 = $140

$140 x 10 weeks = $1400

$1400 + $200 = $1600 total by the end of summer

8 0
3 years ago
Read 2 more answers
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Anni [7]

Answer:

B. card I'' increased by 1.2986 = 13 more than card H's

Step-by-step explanation:

4 0
3 years ago
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