Let the set S = {1,{2},3,4}. Which of the following is true ca.{2} ES
b. {1,2} CS
c.{4} ES
d. ØES
e. {3,4} ES

Need ! give step by step solutions on how to solve number one \frac{9-2\sqrt{3} }{12+\sqrt{3} } number two x+4=\sqrt{13x-20} number three (domain and range) f(x)=2\sqrt[3]{x} +1

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Ten times the square of a non-zero number is eqaul to ninety times the number