An arithmetic gradient series : a)starts at zero at the end of the first period and then increases by a constant amount each period. b)starts at zero at the beginning of the first period and then increases by a constant amount each period. c)starts at zero at the beginning of the second period and then increases by a constant amount each period. d)starts at zero at the end of the first period and then increases by an increasing amount each period. e)starts at zero at the end of the second period and then increases by a constant amount each period.

b)starts at zero at the beginning of the first period and then increases by a constant amount each period.

Step-by-step explanation:

A series is called arithmetic gradient series if it increases or decreases periodically by a constant amount.

Examples are

0,.100,200,300, 400

Decreasing series would be

1000, 800, 600., 400

Thus the difference between the consecutive terms is a constant.

Hence here out of four definitions we find that

b)starts at zero at the beginning of the first period and then increases by a constant amount each period.

answer: (1,3) and (-2,0) i think.

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