Final answer:
To find the number of slices of meat Cooper used on the sandwiches, multiply the number of slices of turkey and ham on each sandwich by the total number of sandwiches. The expression that represents the number of slices of meat Cooper used is 6s.
Step-by-step explanation:
To find the number of slices of meat Cooper used on the sandwiches, we multiply the number of slices of turkey and ham on each sandwich by the total number of sandwiches.
Since Cooper put 3 slices of turkey and 3 slices of ham on each sandwich, and he made s sandwiches, the expression that represents the number of slices of meat Cooper used is 3 * s + 3 * s or 6s.