I need help! Pleasee

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

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?

What is the length of the midsegment of a trapezoid with bases of length 15 and 25 ?