I need a clear explanation please bc i don't get how I'm supposed to do this. :,)

The half-life is the amount of time it takes for some quantity of carbon-14 to decay to half the original amount, or .

In terms of the formula, it's the time such that

and we can divide both sides by the original amount to get

We want to find the time it takes for 57%, or 0.57, of the original amount to remain. This means we solve for in

or

We're given ; plug this in and solve for :

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