The answer it’s 4, hope it helps
You earn $15 per lawn. 1 lawn would be $15. 15(1) is 15.
7 lawns would be 15(7), which is 105.
In a positive integers there are twenty whole numbers I hope this help
<h3>hello!</h3>
==========================================================
Let's simplify the expression:-

Multiply 3 times 1 and 1 times 2:-

======================================================
<h3>note:-</h3>
Hope everything is clear; if you need any clarification/explanation, kindly let me know, and I'll comment and/or edit my answer :)