Solve for (2/5)^8x=25/4

Which expression is equivalent to? assume x > 0 and y > 0.

The parabola opens: y=√x-4 (principal square root) up down right left

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?