Final answer:
The ratio of tomato plants to pepper plants that Deshawn planted is 4:1.
Step-by-step explanation:
To complete the ratio, we need to determine the number of tomato plants and pepper plants that Deshawn planted. The ratio states that for every 4 tomato plants, there is 1 pepper plant. This means that we can put 4 tomato plants as the first part of the ratio and 1 pepper plant as the second part. Therefore, the ratio is 4:1.