6 divided by 2^5 (9x4-5^5+8)

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.

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Which is the scale factor proportion for the enlargement shown?