Does the number 15/3 belong to the set of natural/counting numbers?

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0

Two airplanes start at the same place and travel in opposite directions, one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?

Which pair of numbers is relatively prime? a. 105 and 128 b. 130 and 273 c. 205 and 350 d. 273 and 333