Final answer:
Erica sent more texts and made more phone calls than Tim did today. She sent 18 texts and made 6 calls, while Tim sent 12 texts and made 4 calls.
Step-by-step explanation:
The student is asking to compare the number of texts and calls made by Erica and Tim. Erica sent 18 texts and made 6 calls, while Tim sent 12 texts and made 4 calls. To compare, we simply look at the numbers for each type of communication.
For texts, Erica sent 18 compared to Tim's 12, which means Erica sent more texts than Tim. For calls, Erica made 6 calls as opposed to Tim's 4, which indicates that Erica also made more calls than Tim.
If we were to express this comparison mathematically, we can say Erica's texts and calls exceed Tim's texts and calls. Therefore, the statement that compares their usage is: Erica sent more texts and made more phone calls than Tim did today.