Which of these numbers are irrational: #47, \sqrt 0.09, \sqrt 15, 8/45#? Algebra 1 Answer Tamir E. Nov 26, 2017 only #sqrt15# is irrational Explanation: #47=47/1 => 47 in QQ# #sqrt(0.09)=sqrt(9/100)=3/10 => sqrt(0.09) in QQ# #sqrt(15)=sqrt(5*3)# 5 and 3 are primes #=> sqrt15 notin QQ# #8/45 => 8/45 in QQ# Answer link Related questions How do I determine the molecular shape of a molecule? What is the lewis structure for co2? What is the lewis structure for hcn? How is vsepr used to classify molecules? What are the units used for the ideal gas law? How does Charle's law relate to breathing? What is the ideal gas law constant? How do you calculate the ideal gas law constant? How do you find density in the ideal gas law? Does ideal gas law apply to liquids? Impact of this question 1839 views around the world You can reuse this answer Creative Commons License