The ratio of the number of boys to the number of girls at a school is 4:5. If there are 24 boys, how many students are there altogether?

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

The perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?

Players on the school soccer team are selling candles to raise money for an upcoming trip. each player has 24 candles to sell. if a player sells 4 candles a profit of$30 is made. if he sells 12 candles a profit of $70 is made. determine an equation to model his situation?