10 increased by the
quotient of a number
and 2 is 13.

The number is 6.

Step-by-step explanation:

10+(x/2)=13

10+(1/2)x=13

(1/2)x=13-10

(1/2)x=3

(2)(1/2)x=(2)3

x=6

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