Question

each runner is carrying an 8 ounce bottle of water. a 2.1 ounce energy bar, and a 3 ounce energy drink. write an expression in simplest form that represents the weight carried by y runner. interpret the expression

Answer 1

Each runner carries 8 oz bottle, 2.1 oz bar, and 3 oz drink.
For a total of 13.1 oz.

So if there are "y" runners.  The expression that represents the total weight for all the runners is:

13.1y