Convert 4cm to meters

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.

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Me. i can't figure out this question. give an explanation too. .