Robbie owns 15% more movies that rebecca. if rebecca owns 220 movies, how many does robbie own?

Gretchen is setting up for a banquet. she has 300 chairs and needs to distribute them evenly among t tables. how many chairs should she put at each table? write your answer as an expression.

Solve 2x+y=3 x+y=5 in substitution method

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500