Determine if the given sequence is an arithmetic sequence. if it is, find the common difference, d.
-9, -1,7, 15,
is this an arithmetic sequence?
ο νο
0 yes

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

1.3 million hoops i believe