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klemol [59]
3 years ago
9

Round to nearest tenth

Mathematics
2 answers:
Aleks04 [339]3 years ago
6 0

Answer:

About 24.1 mm²

Step-by-step explanation:

The surface area of a cylinder is the area of the top + base + side.

That can be re written as SA = 2(πr²) + 2πr*h (Area of top + base are the same, and the area of the side is the circumference of the circles*height).

Plugging int he numbers we have, we get:

SA = 2π*(1.2)² + 2π1.2*2.

Simplify: 2π*1.44 + 2π*2.4 --> 2.88π + 4.8π --> 7.68π mm² ≈ 24.1 mm²

finlep [7]3 years ago
4 0

24.13 mm^2

2\pi(r)(h) + 2\pi(  {r}^{2} )

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AURORKA [14]
Basically what is happening is:
You start out with 15. That 1st week you have 22% more than 15, or in other words 15*1.22. The following week you have 22% more than 22% more of 15, which is 15*1.22*1.22.

Now we can write a function that models this situation:
f(n): number of views
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We want to find out how many views there are after four weeks, so plug 4 in for n.

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4 0
3 years ago
Read 2 more answers
Find the sum \[\sum_{k = 1}^{2004} \frac{1}{1 + \tan^2 (\frac{k \pi}{2 \cdot 2005})}.\]
vampirchik [111]

Answer:1002

Step-by-step explanation:

\Rightarrow \sum_{k=1}^{2004}\left ( \frac{1}{1+\tan ^2\left ( \frac{k\pi }{2\cdot 2005}\right )}\right )

and 1+\tan ^2\theta =\sec^2\theta

and \cos \theta =\frac{1}{\sec \theta }  

\Rightarrow \sum_{k=1}^{2004}\left ( \cos^2\frac{k\pi }{2\cdot 2005}\right )

as \cos ^2\theta =\cos ^2(\pi -\theta )

Applying this we get

\Rightarrow \sum_{1}^{1002}\left [ \cos^2\left ( \frac{k\pi }{2\cdot 2005}\right )+\cos^2\left ( \frac{(2005-k)\pi }{2\cdot 2005}\right )\right ]

every \thetathere exist \pi -\theta

such that \sin^2\theta +\cos^2\theta =1

therefore

\Rightarrow \sum_{1}^{1002}\left [ \cos^2\left ( \frac{k\pi }{2\cdot 2005}\right )+\cos^2\left ( \frac{(2005-k)\pi }{2\cdot 2005}\right )\right ]=1002                          

6 0
3 years ago
-26 times a number minus 22 is equal to 90 less than the number.
Novay_Z [31]

-26n -22= n - 90

-26 times a number: -26n

minus 22: -22

equal: =

90 less than a number: n - 90

Solving the Equation:

Move n to the left side of the equal sign (which becomes -n) in order to combine like terms:

-26n-n-22= -90

Move -22 to the right side of the equal sign which becomes +22

-26n-n=-90+22

solve both sides; -26n-n= -27n and -90+ 22= -78

-27n=-78

n= 2.888888

5 0
3 years ago
connie sells lemonade for $0.25 per small cup and $0.75 per large cup. if she sells 20 small cups how many large ones must she s
SIZIF [17.4K]

Answer:

Not accomplishable.

Step-by-step explanation:

Could you please stucture this question more simply. This partly doesn't make sense, unless I am wrong.

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The ferry between the island and the mainland makes one round trip a day. On Monday the ferry carried 83 people to the island an
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You can subtract 114-83 which equals 31
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