Mary purchased a prepaid phone card for $15 . long distance calls cost 7 cents a minute using this card. mary used her card only once to make a long distance call. if the remaining credit on her card is $13.46 , how many minutes did her call last?

Which matrix multiplication is possible?

What kind of bond pays interest which is exempt from tax?

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning