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kaheart [24]
3 years ago
14

Which of the following

Mathematics
1 answer:
11Alexandr11 [23.1K]3 years ago
4 0

Answer:

B is the answer to the problem

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The standard deviations of four data sets are shown in the table below. Which
seropon [69]

You are correct. The higher the standard deviation is, the more spread out the data set will be. Nice work.

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3 years ago
David swam in 312 events during the last 6 years. He swam the same number of events each year.
natta225 [31]

Answer:

52

Step-by-step explanation:

Divide 312 by 6 to find the number of events he swam per year

5 0
2 years ago
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What is the greatest common factor of 150, 275 and 420
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I believe the answer is 5!

Step-by-step explanation:

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3 years ago
Match the pairs of equations that represent concentric circles. Tiles
Darina [25.2K]
I will explain you and pair two of the equations as an example to you. Then, you must pair the others.

1) Two circles are concentric if they have the same center and different radii.

2) The equation of a circle with center xc, yc, and radius r is:

(x - xc)^2 + (y - yc)^2 = r^2.

So, if you have that equation you can inmediately tell the coordinates of the center and the radius of the circle.

3) You can transform the equations given in your picture to the form (x -xc)^2 + (y -yc)^2 = r2 by completing squares.

Example:

Equation: 3x^2 + 3y^2 + 12x - 6y - 21 = 0

rearrange: 3x^2 + 12x + 3y^2 - 6y = 21

extract common factor 3: 3 (x^2 + 4x) + 3(y^2 -2y) = 3*7

=> (x^2 + 4x) + (y^2 - 2y) = 7

complete squares: (x + 2)^2 - 4 + (y - 1)^2 - 1 = 7

=> (x + 2)^2 + (y - 1)^2 = 12 => center = (-2,1), r = √12.

equation: 4x^2 + 4y^2 + 16x - 8y - 308 = 0

rearrange: 4x^2 + 16x + 4y^2 - 8y = 308

common factor 4: 4 (x^2 + 4x) + 4(y^2 -8y) = 4*77

=> (x^2 + 4x) + (y^2 - 2y) = 77

complete squares: (x + 2)^2  - 4 + (y - 1)^2 - 1 = 77

=> (x + 2)^2 + (y - 1)^2 = 82 => center = (-2,1), r = √82

Therefore, you conclude that these two circumferences have the same center and differet r, so they are concentric.
5 0
3 years ago
Pls help asap math isn't my thing
stira [4]

Your answer is in the picture above

6 0
3 years ago
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