I am interpreting your question as 7 * 3/4. First we multiply 7 and 3 together to get 21. Now we divide 21 by 4. Because 21 isn't divisible by 4 and they share no common factors, 21/4 is our answer.
Answer:

Step-by-step explanation:
Given
Represent lifeguarding cars with L
Represent washing cars with W
--- at most
Required
Express the scenario as an inequality
First, we need to determine the number of hours Lauren can work.
This is calculated as follows:

From the question, we understand that the total hours cannot exceed 9 hours.
This can be expressed as 
So, we have:

Substitute L + W for Total Hours

6 is c, i'm not entirely sure about 7