What is 4.9 as a fraction in simplest form?

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

All per-unit concepts rely on ratios,meaning,to provide a type of measurement

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