Một phòng họp có 180 người được xếp đều trên các dãy ghế. Nếu thêm 80 người thì phải kê thêm 2 dãy ghế và mỗi dãy ghế tăng thêm 3 người. Hỏi lúc đầu phòng họp đó có bao nhiêu dãy ghế ?

Driving 75 mph, it takes alicia 2 hours to reach the airport to go on a vacation. it then takes her 4 hours to get to her destination with the jet traveling at a speed of 400 mph. how many miles does alicia travel to get to her destination?

Create and solve a linear equation that represents the model, where squares and triangles are shown evenly balanced on a balance beam. assume the weight of a square is 1 unit and the weight of a triangle is unknown.

Suppose sat writing scores are normally distributed with a mean of 497 and a standard deviation of 109. a university plans to award scholarships to students whose scores are in the top 2%. what is the minimum score required for the scholarship? round your answer to the nearest whole number, if necessary.