Un cuarto de la suma de dos números es 45 y un tercio de su diferencia es 4.
Hallar los números.

Find dy/dx using implicit differentiation ln(20+e^xy)=y

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

Icould really use some with this question.