What's the nearest hundred thousand to 491,852

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.