For the curve given by ind the following: dy 1. = 3²-3 2. de = 4t 3 3. d 4. d 3 4t Determine the open t-interval on which the curve is: a. concave upward: (0,00) b. concave downward: (-∞,0) x = 2t² and y = t³ - Enter INF for infinite, DNE if the interval doesn't exist.

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