Scientists around the world have collected data revealing that there is a linear relation- ship between the length (snout-to-vent) of a snake and the length of the fish that they can eat. This relationship is given by l(z) = -3.6 +0.17r where x is the snout-to-vent length (cm) of the snake and 1(r) is the predicted length(cm) of the fish. (a) Use the function to estimate the size of fish that a snake whose snout-to-vent length is 70 cm, will choose for their prey. (b) Calculate l'(70) and interpret the results.

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