I need help ASAP please

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?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?