A range is the amount of time from a start of the action up to the end of the action so in your question where a function is created to present the amount of text sent each month. So the best possible restriction of the range is "The range would only include positive integers"
Given :
Now, Substituing the value of y in equation (ii) :
Now, substituting the value of x in equation (i) :
1/3 = 8/24
1/4 = 6/24
An Answer to 31 is 7/24
0.89
0.90
An Answer to 32 is 0.895
-2/3
1/2
An Answer to 33 is -1/2
0.27 = 27/100
4/5 = 80/100
An Answer to 34 is 54/100 = 27/50