A "roster" here is essentially a version of the set with all of elements listed out. Here, those elements are all of the odd numbers between 20 and 30, so our list would be
{21, 23, 25, 27, 29}
Rachel fills 13 water bottles per hour, so she contributes 13R. Alyssa fills 15 bottles an hour, so she contributes 15A, plus 5 for the additional water bottles filled. Thus, the full expression is:
13R+15A+5
If the number is between 25 and 35 It would have to be either 28 or 32.
<span><span>
You convert it to meters first. </span>So you get 701000m and 523445m<span>You subtract the values and get this: 177555</span></span>
<span><span /></span><span>So your answer is <span>177555</span></span>
<span><span>Hope this helps :)</span></span>
