3) Consider the curve defined by x2 + xy + y = 25. a) What is...

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3) Consider the curve defined by x2 + xy + y = 25. a) What is the value of the second derivative at the point (0,5)? b) Does the curve have a horizontal tangent at the point (-5,5)? Give a reason for your answer. 3) Consider the curve defined by x2 + xy + y = 25. a) What is the value of the second derivative at the point (0,5)? b) Does the curve have a horizontal tangent at the point (-5,5)? Give a reason for your answer.