chynalee4713 chynalee4713 10-11-2019 Mathematics contestada There were 15 students who brought an item for show-and-tell. Each student had 3 minutes to present their item. Write an equation to find how long show-and-tell lasted. 15 × 3 = m 3 − 15 = m 15 ÷ m = 3 m × 3 = 15 m × 15 = 3