17. If f = {(1,2), (2, 4), (3, 6), (4,8), (5,10)), g = {(4,9), (5, 11), (6, 13), (7, 15), (8, 17)} and (fog)-1(x) find the positive value of x. it's a optional mathematics Questions please solve him
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Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

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.

Me. i can't figure out this question. give an explanation too. .