Identify the set of integers less than −6 or greater than 21 in set-builder notation. A. {x|x∈R and x<−6 or x>21}
B. {x|x∈R and x>−6 or x<21}
C. {x|x∈Z and x<−6 or x>21}
D. {x|x∈Z and x>−6 or x<21}

Standard deviation of 19,29,21,22,23

If a is a nonzero real number then the reciprocal of a is

Jessica is organizing a guided tour of the rain forest. the average profit per person that the touring company makes is given by the rational expression 18x+35/x, where x is the number of people going on the tour. what does the numerator of this rational expression represents?