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kogti [31]
3 years ago
10

Is 28 rational or irrational

Mathematics
2 answers:
Sonja [21]3 years ago
6 0
28 is a rational number
andreyandreev [35.5K]3 years ago
6 0
28 is a rational number because it can be expressed as the quotient of two integers

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X + ky = 1
Marina CMI [18]
X + k y = 1
k x + y = 1  / * ( - k )
----------------
      x + k y = 1
- k² x - k y = - k
--------------------
x - k² x = 1 - k
x ( 1 - k² ) = 1 - k
x = ( 1 - k ) / ( 1 - k² ) = ( 1 - k ) / ( 1 - k ) ( 1 + k )
y = 1 - k( 1 - k )/( 1 - k² )
y = ( 1 - k ) / ( 1 - k² ) = ( 1 - k ) / ( 1 - k ) ( 1 + k )
a ) For  k = - 1 this system has no solution.
b ) For k ≠ - 1 and k ≠ 1, the system has unique solution:
( x , y ) = ( 1/ (1 + k) ,  1/( 1 + k ) ).
c ) For k = 1, there are infinitely many solutions.

3 0
3 years ago
What does the transformation f(x)↦f(-x) do to the graph of f(x)?
Vlad1618 [11]
The function will simply get reflected about the y-axis.
Let's approach this through what we know. Since we know that the x values are mirrored, we know that the points in Quadrant I and IV will be reflected over to the negative side, Quadrants II and III, because they simply change in signs.

However, we also know that the function y-values do not change. This is because whatever the x values are don't change the range and y-values of an even function.

To be more specific, if we have an even function, we are most likely dealing with quadratics or variants/transformations of the quadratic function.

If we were to have 2, and -2, and we wanted to plug them into the equation:
y = x^{2} + C, the signs do not change the y-values of the function.
Hence, we know that it ONLY gets reflected across the y-axis.
6 0
3 years ago
Cost of a chair
pashok25 [27]
1,200 divided by 4= 3,000
3,000 is your answer.
5 0
3 years ago
5-6x=17-8x<br><img src="https://tex.z-dn.net/?f=5-6x%3D17-8x%20%5C%5C%20" id="TexFormula1" title="5-6x=17-8x \\ " alt="5-6x=17-8
EastWind [94]
I hope I help you out

7 0
4 years ago
How do you find rate of change using a graph?
worty [1.4K]

Answer:

Look at one point and then go over and down and over would be the top and the down would be the bottom number

Step-by-step explanation:

8 0
4 years ago
Read 2 more answers
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