Question

In a certain country, a letter up to 1 ounce requires postage in the amount of $0.42, and each additional ounce (or fraction of an ounce) has an additional cost. The function below represents the cost of mailing one letter in this country.

f(c)=0.42 + 0.20[x-1]

Josiah has two letters. The first weighs 2.9 ounces, and the second weighs 4.1 ounces. What is the total amount Josiah can expect to pay for postage?
$1.62
$1.64
$1.84
$2.04

Answer 1

f(c) = 1.62 when you substitute in

Answer 2

Total amount Josiah can expect to pay for postage is:

$ 1.84

Explanation:

cost of mailing one letter in the country is:

f(x)=0.42 + 0.20[x-1]

The first weighs 2.9 ounces, and the second weighs 4.1 ounces.

Cost of mailing first letter=0.42+0.20(2.9-1)

=0.42+0.38

=$ 0.8

Cost of mailing second letter=0.42+0.20(4.1-1)

=0.42+0.62

=$ 1.04

total cost=$(0.8+1.04)

=$ 1.84

Hence, total amount Josiah can expect to pay for postage is:

$ 1.84