Assume that when adults with smartphones are randomly selected, 52 % use them in meetings or classes. if 15 adult smartphone users are randomly selected, find the probability that exactly 9 of them use their smartphones in meetings or classes.

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )