Answer:
Lawns ---Earnings
1 ----------------- 10
2 ----------------- 20
3 ----------------- 30
5 ----------------- 50
Explanation:
Given
Earnings = $10 per lawn
Required
Complete the table
Let y be the earnings for x number of lawns
Since he earns $10 per x lawns, then the expression is:

To complete the table, we have the following:
When x = 1

When x = 2

When x = 3

When x = 5

So, the complete table is:
Lawns ---Earnings
1 ----------------- 10
2 ----------------- 20
3 ----------------- 30
5 ----------------- 50