Asap! which number system best describes this set? {-10, 0, 28/7, 102.9} a) integers b) natural numbers c) rational numbers d) irrational numbers

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Brent wants to know what is 5 x 1/2

Refer to interactive solution 17.45 to review a method by which this problem can be solved. the fundamental frequencies of two air columns are the same. column a is open at both ends, while column b is open at only one end. the length of column a is 0.504 m. what is the length of column b?