㏑(x²+2x) có tập xác định là gì

Write the fraction or mixed number and the decimal shown by the model

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?

Is there an x intercept in the equation 60*1.15^x