Represent the work done by Sarah after x hours if she can finish it in 5 hours alone

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

If you could answer these your a life saver