How can logarithms be used to solve exponential equations?

Find the values of y: 3y^3(y^2+ 2/3y)=0

How can you tell when x and y are not directly proportional?

Ms.ortiz sells tomatoes wholesale. the function p(x)=-80x^2+320x-10, graphed below, indicates how much profit she makes on a load of tomatoes if she makes on a load of tomatoes if she sells them for 4-x dollars per kilogram. what should ms.ortiz charge per kilogram of tomatoes to make on a load of tomatoes?