Final answer:
The equation that can be used to show how many boxes Sam made is Number of boxes = 78 / 316. This equation can be simplified to Number of boxes = 13.
Step-by-step explanation:
To find the equation that shows how many boxes Sam made, we need to divide the length of the piece of wood Sam bought by the length of wood used for each box. Sam bought a 78-foot piece of wood and used 316 foot of wood for each box.
So, the equation that can be used to show how many boxes Sam made is:
Number of boxes = Length of wood bought / Length of wood used for each box
Number of boxes = 78 / 316 (feet)
This equation can be simplified to:
Number of boxes = 13