HEL Is the following number rational or irrational? \sqrt{99} Choose 1 Choose 1 (Choice A) A Rational (Choice B) B Irrational

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

What are the domain and range of the function f(x)=2^x+1

Ithink i know it but i want to be sure so can you me out ?