The height of a dolphin, h (in metres), with respect to time, t, in seconds is given by the equation h(t) -t4+t³-47t² + 20t == 12 dolphin is below the water a. 6 - 87 a negative value for h indicates that the 4 Given the critical numbers for h(t) are t = 3, t = 4 and t = 5, use the first derivative test to indicate the time intervals between 0 and 8 seconds for which the dolphin is swimming upwards and for which the dolphin is swimming downwards.

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