The figure shows the cost Of mailing a first class letter f(x) in a country as a function of its weight. X in ounces. What is the cost of mailing a letter that weighs 3.8 ounces.

Answer:
$0.95
Explanation:
Taking into account the graph, the cost of mailing a letter that weighs between 3 and 4 pounds is $0.95.
Since 3.8 is a number between 3 and 4, the cost of mailing a letter that weighs 3.8 ounces is $0.95