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Mark drives his car along a straight highway. The velocity of his car at time t is given by
v(t) = 4.2\t³ + 2t. The velocity is in miles per hour. If he is at mile marker 12 when t = 6 hours,
Determine the nearest mile marker at t = 6.5 hours.
(А) 34
(В) 46
(С) 51
(D) 62
A
O B
O D

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