The cost of first-class postage in the united states increased approximately 5.4% in january of 2006 to 39 cents. what was the pre- january cost of the first-class stamp? round your answer to the nearest penny. a. $0.30 c. $0.35 b. $0.33 d. $0.37

d. $0.37

Step-by-step explanation:

The cost was 100% of the cost before the increase. Let the unknown cost be x. Before the increase, the cost was 100% of x which is just x. After a 5.4% increase, the cost became 105.4% of x.

105.4% of x = 0.39

105.4% * x = 0.39

1.054x = 0.39

x = 0.39/1.054

x = 0.37

37 cents

the slope of the line is 60

one point on the line is (40,10)

step-by-step explanation:

in the equation outside the parenthesis the equation always tells you the slope. in this case it is 60.

in the parenthesis is also says 40 which is x because it is near the x and 10 is y because it is near y.

step-by-step explanation:

mean or average is 40.6