The us postal rates for a first class letter are
$0.46 for up to and including 1 ounce
$0.66 for 1 to 2 including 2 ounces
$0.86 for 2 to 3 including 3 ounces
$1.06 for 3 to 3.5 including 3.5 ounces
(b) what is the cost for a letter weighing 1 ounces?

.46

Step-by-step explanation:

.46 for up to one ounce

i really dont know

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