The length L that a spring will stretch varies directly as the force f applied to the spring.

1. What is the equation of the variation, given that is the constant?

2. If a force of 10 pounds will stretch a spring by 2 inches, then what force will stretch the

same spring by 3 inches?

The time to complete a project varies inversely with the number of employees.

3. If 4 people can complete the project in 5 days, then what is the constant k of the

variation?

4. How long will it take 5 people to finish the project?

The number of sorted letters varies directly as the number of working hours.

5. If a mailman can sort out 738 letters in 6 hours, then what is the constant k of the

variation?

6. How many letters can be sorted out in 9 hours?

The number of days needed in repairing a house varies inversely as the number of men

working.

7. What is the equation of the variation, given that is the constant?

8. If it takes 15 days for 2 men to repair the house, then what is the constant of the

variation?

9. How many men are needed to complete the job in 6 days?​