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Irina-Kira [14]
3 years ago
8

Express each sum in sigma-notation 1 + 1/4 + 1/9 + 1/16 + ... + 1/400

Mathematics
1 answer:
xz_007 [3.2K]3 years ago
7 0

9514 1404 393

Answer:

  \displaystyle\sum\limits_{n=1}^{20}{\dfrac{1}{n^2}}

Step-by-step explanation:

We notice that the denominator of each term is the square of the term number, so the last term must be the 20th. The sum is then ...

  \displaystyle\sum\limits_{n=1}^{20}{\dfrac{1}{n^2}}

You might be interested in
A sphere and a right cylinder have the same radius and volume. The cylinder has a height of 6 centimeters. What is the radius?
zysi [14]
You are going to solve this in such a quick, slick way
that you will blink and not believe it.  Fasten your seat belt.

Here are the tools you'll need:

--  Volume of a cylinder  =  (pi) (radius)² (height)

--  Volume of a sphere  =  (4/3) (pi) (radius)³

Now ... the question says that your cylinder and your sphere
have the same volume.  Fine !  So you can immediately write
an equation saying that their volumes are equal.

                               (pi) (radius)² (height)  =  (4/3) (pi) (radius)³

Divide each side by pi:    (radius)² (height)  =  (4/3)       (radius)³

Divide each side by (radius)²        (height)  =  (4/3)        (radius)

Fill in the given height:                  (6 cm)    =  (4/3)      (radius)

Multiply each side by  3/4 :    (6 cm) x (3/4)  =             radius

I'm pretty sure that you can take over now and find the radius.
4 0
3 years ago
Find the range of f given the domain<br> = {-2, 0, 5, 9}
muminat

Answer:

The range to {-2, 0, 5, 9} is 11

Step-by-step explanation:

Subtract the minimum data value from the maximum data value to find the data range. In this case, the data range is 9 − − 2 = 11 .

11

I hope this helps

6 0
3 years ago
In ∆ABC the angle bisectors drawn from vertices A and B intersect at point D. Find m∠ADB if: m∠C=γ
mylen [45]

Answer:

  ∠ADB = γ/2 +90°

Step-by-step explanation:

Here's one way to show the measure of ∠ADB.

  ∠ADB = 180° - (α + β) . . . . . sum of angles in ΔABD

  ∠ADB + (2α +β) + γ + (2β +α) = 360° . . . . . sum of angles in DXCY

Substituting for (α + β) in the second equation, we get ...

  ∠ADB + 3(180° - ∠ADB) + γ = 360°

  180° + γ = 2(∠ADB) . . . . . . add 2(∠ADB)-360°

  ∠ADB = γ/2 + 90° . . . . . . . divide by 2

_____

To find angles CXD and CYD, we observe that these are exterior angles to triangles AXB and AYB, respectively. As such, those angles are equal to the sum of the remote interior angles, taking into account that AY and BX are angle bisectors.

5 0
3 years ago
Help please quick!!!
stepan [7]

Answer:

9,000 is the answer you are looking for

3 0
3 years ago
Which of the following systems of inequalities represent the graph?
Oduvanchick [21]
The answer to your question is 2 and 4.
8 0
4 years ago
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