Consider the following parametric curve. Answer parts a and b. x= 2t, y = t*; t= - 1 a. Determine dy in terms of t and evaluate it at the given value of t. dx Select the correct choice below and, if necessary, fill in the answer box within your choice. O A. The value of at t= -1 is dx (Simplify your answer.) O B. The value of at t= - 1 is undefined. b. Make a sketch of the curve showing the tangent line at the point corresponding to the given value of t. In each graph below, the blue dotted line is the tangent line and the red line is the curve. Choose the correct graph below. OA. OB. OC. OD.

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