1. The problem describes a function machine where the input is labeled $d$ and the operation inside the machine is adding 72 to the input. 2. This means the function can be written as: $$f(d) = d + 72$$ 3. To find the output, you take the input value $d$ and add 72 to it. 4. Since the input $d$ is a variable, the output is expressed as $d + 72$. Therefore, the output of the function machine is: $$d + 72$$