Plls help. Look at the question carefully plls

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?

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

What is the value for this expression? 2e-5