Will give brainleast need asap

john is trying to find out how long he must make a staircase for his new deck which is 12 ft. high. he wants to start the stairs 21 ft. from the deck. how long a staircase does he need?

The verbal translation for the difference of m and 7 increased by 15

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

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?