How could you add -13 + 10? A Add 13 + 10, and keep the negative sign from the -13. B Add 13 + 10, and keep the positive sign from the 10. C Subtract 13 - 10, and keep the negative sign from the -13. D Subtract 13 - 10, and keep the positive sign from the 10.

Is a positive integer raised to a negative power always positive

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.

How can you tell when x and y are not directly proportional?