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At 6 1/2 cents per pound of string beans how much does 7 pounds cost

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?

Ade and abc are similar. which best explains why the slope of the line between points a and d is the same as the slope between points a and b?