Idon't understand number 13 a. b. and c in the go math book on psge 159

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

The first side of a triangle measures 5 in less than the second side, the third side is 3 in more than the first side, and the perimeter is 17 in. how long is the third side? if s represents the length of the second side, which of the following represents the length of the third side? s-5 ws-2 s+ 3 next question ask for turn it in

Using inductive reasoning, what are the next two number in this set? 2,3/2,4/3,5/4,