13. Given 5n - 42 = 12n; Prove: n= -6

Isuck at math ; ^; m a student solved this problem and said the answer is 3 feet. chase had a roll of ribbon that contained 7 7/8  feet of ribbon. he cut off one piece that was 3 5/8  feet long and another piece that was 1 1/4  feet from the roll. how much ribbon was left on the roll? is the student's answer reasonable? yes, the answer is reasonable. no, the answer is not reasonable. it should be about 2 feet. no, the answer is not reasonable. it should be about 13 feet. no, the answer is not reasonable. it should be about 4 feet.

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.