Assume that when adults with smartphones are randomly​ selected, ​38% use them in meetings or classes. If 8 adult smartphone users are randomly​ selected, find the probability that exactly 8 of them use their smartphones in meetings or classes.

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field