Question

In 2002, the price of mailing a letter was $0.34 for the first ounce or part of an ounce and $0.21 for each ounce or part of an ounce after the first ounce. How much did it cost to mail a four-ounce letter?

Answer 1

Answer: D. F(x)= 0.34 + 0.21 (x-1) ; $0.97

Explanation:

Let x = the weight of the letter in ounces .

F(x) = 0.34 + 0.21 (x -1)

F(4)= 0.34 + 0.21 (4-1)

F(4)= 0.97

Answer 2

The equation would be .34 + .21(x -1) = C where x is the number of ounces and C = the cost. Let x = 4 to answer the question.
.34 + .21(4-1) = C Do the work in the parentheses
.34 + .21(3) = C multiply
.34 + .63 = C Add
.97 = C
The cost to mail the letter is $0.97.