#### Answer

16+5d, where d=number of days.

#### Work Step by Step

In the question, it states that you start with 16 tomatoes. If your tomato plant produces 5 tomatoes each day, you will want to multiply 5 tomatoes by the number of days and add that to your 16 original tomatoes. Therefore, 16+5d= total number of tomatoes after a certain number of days.