(If tan A=)
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See explanation

Step-by-step explanation:

In the question It is not mentioned that in which quadrant does angle A lie, so we will assume it to be in first quadrant.

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

irrational, cannot