PLEASE HELP! 10 POINTS! I WILL MARK BRAINLIEST!! there are three separate questions, look at photo for the questions and information. *ignore the graph part, you don’t need to do that*

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.

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Answer! if you don’t mind, can you explain