Devaughn's age is two times sydney's age. the sum of their ages is 60
. what is sydney's age?

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 i'm with my factor 5, my prodect is 20 .when i'm with my addend 6' my sum is 10.what number am i

If the diagram polygon abcd is a reflection across ef to make polygon a'b'c'd'.