Convert 3.92 into mixed fraction in simplest form

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.

Does anyone know how to do geometryme with this problem

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5