Danielle ran a total of 15 miles over the course of 5 track practices. how many track practices would it take for danielle to run 18 miles? assume the relationship is directly proportional.

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

The distribution of a sample of the outside diameters of pvc pipes approximates a symmetrical, bell-shaped distribution. the arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. about 68% of the outside diameters lie between what two amounts?

Ablue whale traveled 3112 miles in 214hours. what was the whale's rate in yards per hour? (1 mile = 1,760 yards)