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

Question

Shaun

Mathematics

28 September, 10:42

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

Answers (1)

Know the Answer?

Giselle · Answer 1

Given:

1st letter : 2.9 ounces

2nd letter: 4.1 ounces

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

f (1) = 0.42 + 0.20 (2.9-1)

f (1) = 0.42 + 0.20 (1.9)

f (1) = 0.42 + 0.38

f (1) = 0.80

f (2) = 0.42 + 0.20 (4.1-1)

f (2) = 0.42 + 0.20 (3.1)

f (2) = 0.42 + 0.62

f (2) = 1.04

0.80 + 1.04 = 1.84 last choice