how do you find the missing number/what is the missing number?

Solving a Single Variable Equation :

Solve  :    3x+1 = 0

Subtract  1  from both sides of the equation :

                3x = -1

Divide both sides of the equation by 3:

         x = -1/3 = -0.333

One solution was found :

         x = -1/3 = -0.333

56

step-by-step explanation:

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