In a game, a player earns 50 points for each question answered correctly and earns -10 points for each question answered incorrectly. A player answers 18 questions correctly and 7 questions incorrectly. Write a numeric expression to represent the total number of points the player earned.
The total number of points earned for answering questions correctly is 18*50 = <<18*50=900>>900 points.
The total number of points earned for answering questions incorrectly is 7*-10 = <<7*-10=-70>>-70 points.
The total number of points the player earned is 900 + -70 = <<900+-70=830>>830 points. Answer: \boxed{830}.