Plz ! : ) asap. which of these sets of numbers contains no irrational numbers?

How do you find the circumfrance of a circle?

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

One astronomical unit (1 au) is about 1.496 alt tag missing. kilometers. if you wrote this number of kilometers in regular decimal notation (for example, 528 and 3,459 are written in regular decimal notation), how many zeros would your number have?