Let f be a function of two variables that has continuous partial derivatives and consider the points A(9, 5), B(11, 5), C(9, 7), and D(17, 11). The directional derivative of f at A in the direction of the vector AB is 5 and the directional derivative at A in the direction of AC is 12. Find the directional derivative of f at A in the direction of the vector AD. (Round your answer to two decimal places.)

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the k side

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we need to see the graph to know but

strong positive is if it is going up from left to right in a straight diagonal line (like this /)

strong negative is the same but from right to left (like this \)

weak negative is the same as strong negative but its more straight line still right to left

and weak positive is the same as strong positive but more a straight line still left to right though.