Can someone please help?

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Nine more than four times a number is the same as one less than twice the number. find the number?

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?