standard_description: Use rational approximations of irrational numbers to compare the size of irrational numbers, locate them approximately on a number line diagram, and estimate the value of expressions (e.g., p^(2)). For example, by truncating the decimal expansion of Ö2, show that Ö2 is between 1 and 2, then between 1.4 and 1.5, and explain how to continue on to get better approximations.
problem_activity: Task
Ty took the escalator to the second floor. The escalator is 12 meters long, and he rode the escalator for 30 seconds. Which statements are true? Select all that apply.
He traveled 2 meters every 5 seconds.
Every 10 seconds he traveled 4 meters.
He traveled 2.5 meters per second.
He traveled 0.4 meters per second.
Every 25 seconds, he traveled 7 meters.


aligns: no