All categories

3 years ago

What is 1+2+3+4...+20?

Mathematics

2 answers:

Ray Of Light [21]3 years ago

8 0

When you add consetituve numbers, the formula is $1+2+3+4+...+n=\frac{n(n+1)}{2}$ .

Therefore, plugging in 20, you get 20*21/2=210.

Rzqust [24]3 years ago

8 0

Answer:

210

Step-by-step explanation:

You can just add these terms up.

1 + 2 + 3 + 4... + 20 is the same as writing out:

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20

Add the numbers together to get your answer of 210.

You might be interested in

Do a backflip then do a backflip

rosijanka [135]

Answer:huh

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

A student designed this sculpture. Using the dimensions on the sculpture, find the dimensions of each rectangular prism. Then ca

jolli1 [7]

Answer:

Prism Y

$Height = 12in$

$Length = 6in$

$Width = 4in$

$Volume = 288in^3$

Prism Z

$Height = 18in$

$Length =10in$

$Width = 10in$

$Volume = 1800in^3$

$Total = 2088in^3$

Step-by-step explanation:

Given

See attachment for sculpture

Solving (a) The dimension and volume of Y

From the attachment

$Height = 18 - 6$

18 in is the height of Z and 6in represents the length (height) of the unoccupied space by Y

So:

$Height = 12in$

$Length = 16 - 10$

16 in is the total length of the sculpture and 10 in represents the length of Z

So:

$Length = 6in$

$Width = 10 - 6$

10 in is the width of Z and 6in represents the length (width) of the unoccupied space by Y

So:

$Width = 4in$

Hence, the dimension of Y is:

$Height = 12in$

$Length = 6in$

$Width = 4in$

Volume is then calculated as:

$Volume = Length * Width * Height$

$Volume = 12in * 6in * 4in$

$Volume = 288in^3$

Solving (b) The dimension and volume of Z

As identified in (a), the dimensions of Z are:

$Height = 18in$

$Length =10in$

$Width = 10in$

Volume is then calculated as:

$Volume = Length * Width * Height$

$Volume = 18in * 10in * 10in$

$Volume = 1800in^3$

Solving (c): Total volume of the sculpture.

To do this, we simply add up the volumes of Y and Z.

So, we have:

$Total = 288in^3 + 1800in^3$

$Total = 2088in^3$

6 0

3 years ago

Can u explain how to do this math problem not tell me the answer<br><br>am i correct is it origin?

Alex73 [517]

Your wrong, its ordered pair

6 0

3 years ago

Help me please

andrezito [222]

Answer:

A. The area of a rectangle is equal to all the areas of the small rectangles. The dimensions of the small rectangles are 2a, 3a, and 4a. If you add those areas up, 2a+3a+4a equals the area of the large rectangle.

B. The area of a rectangle equals the width and height. The height of the large rectangle is already shown in the picture, a. The width is seperated into three portions, 2, 3, and 4. To find the total width, add 2+3+4. Now, multiply the width by the height to calculate the area. (2+3+4)a

5 0

3 years ago

Simplify.<br> y = (x + 1)2 -

defon

Answer:

Step-by-step explanation:

Assuming it is supposed to be y = 2- (x+1)

y= x-1

or if it is supposed to be y = -2(x+1)

y= -2x-2

3 0

3 years ago