Question

The cost to mail a letter is a base charge of $0. 42 plus $0. 17 for each ounce. Write an expression to represent the cost for mailing a letter that is w ounces. Then find the cost for mailing a letter that is four ounces

Answer 1

c = 0.17w + 0.42

$1.10

Explanation:

Let total cost = c.

Let number of ounces = w.

total cost = fixed cost + cost per ounce

fixed cost = $0.42

cost per ounce = $0.17

cost for w ounces = $0.17w

total cost = fixed cost + cost per ounce

c = 0.42 + 0.17w

The expression is:

c = 0.17w + 0.42

For 4 ounces, w = 4.

c = 0.17 × 4 + 0.42

c = 1.1

Answer:

c = 0.17w + 0.42

$1.10