What is the range of possible sizes for side r? 8.5 8.0​

For the equations below which statement is true ?

What is the difference between the predicted value and the actual value

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?