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boyakko [2]
3 years ago
7

What is the mean for this list of numbers? 17, 19, 21, 23

Mathematics
2 answers:
Svetlanka [38]3 years ago
7 0

Answer:

The mean is 20

Step-by-step explanation:

17+19+21+23=80

80 div 4 = 20

pychu [463]3 years ago
5 0

Answer:

20.

Step-by-step explanation:

The mean = (sum of the numbers)  / 4   as there are  a total 4 numbers in the list.

Mean = (17+19+21+23) / 4

= 80 / 4

= 20.

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What is the hyperbola 25x^2-100y-9y^2-90x-350=0 in standard form?
sergij07 [2.7K]
WE need to complete the square on the x and y terms:-

25x^2 - 100x - 9y^2 - 90y = 350
25(x^2 - 4x +    ) - 9(y^2 + 10x       )  =   350 + 25(  )  - 9(  )
25(x^2 - 4x  + 4 ) - 9(y^2 + 10x  + 25)  = 350  + 25(4)  - 9(25)
25(x - 2)^2 - 9(y + 5)^2 = 

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----------------    --------------            --------
    225                 225                    225

  ( x  - 2)^2         (y + 5)^2  
  -------------   -   --------------  =    1         Answer
        9                    25                               



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