Questions:

1. Given k = 40 and y = 400, find the value for x.
   
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2. If Susan charged her client $400 for 10 h of work, what does Susan charge per hour?
   
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3. Using Susan's fees per hour found in question 2, calculate what a client would owe Susan for 36h of work. What would a client owe Susan for 18h of work?
   
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4. The amount of money you earn in a week varies directly with the number of hours. If you earned $50 when you worked 10 h, what will you earn if you work 12 h?
   
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5. It has been determined that the time it takes to fill a container with water varies directly with the volume of the container. How long will it take to fill a 21 gal container if it takes 6 min to fill a 3 gal container?
   
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