A39-foot-long speaker wire is to be cut into three pieces. one piece is to be 13 feet long. of the remaining pieces, one must be 2 feet less than 3 times the length of the other. find the length of the shorter piece

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

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.

Which function has an inverse function? a.f(x)= |x+3|/5 b. f(x)= x^5-3 c. f(x)= x^4/7+27 d. f(x)= 1/x²