Answer
The cost of mailing a letter that weighs 1.5 ounces is $0.71$ dollars.
Work Step by Step
Consider the given graph.
The cost of mailing a letter of weight 1.5 ounces is the value of the function at a weight of 1.5 ounces.
The cost of mailing a letter that weighs 1.5 ounces can be calculated as below:
We can observe from the graph that the value of the function remains constant from $x=2$ to $x=3$.
So the value of the function at $x=1.5$ is as follows:
$f\left( 1.5 \right)=0.71$
Hence, the cost of mailing a letter that weighs 1.5 ounces is $0.71$ dollars.
