Ceraldo has 3 iewer marbles than Yan, Torgether, they have 21 marcas, Wrich pution represents this situation?
2* (3-2) = 21, where a is the nurse modes von hos
2+ (1-3) = 21, where x is the numar ch made adco tos
4+(2-1)=21, mere z is the nursinar ch matdes paucores
1+(2-3)=21, where x is the nurser o modes ten hos

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