What is the range of possible sizes for side ‘x’?

In every triangle, the sum of two sides must exceed the third one. So, we have three inequalities:

So, x has to be less than 6.7, and more than 1.3 (since this request overrules the other one, because it's more restrictive)

from the figure we get,

the x axis shows   the months and,

the y-axis shows the number of satisfied customer.

each line or each cell in upward direction (y-axis) shows 500.

the appropriate scale for the y - axis is: -

a = 2000 customers

b = 4000 customers

c = 6000 customers

d = 8000 customers

e = 10000 customers

f = 12000 customers

g = 14000 customers