The total solar radiation H (in me2) on a particular surface during an average clear day is given by the following function, where t ( 6 sts 6} is the number of hours from noon {6 AM. is equivalent to t = 6)_ Find the instantaneous rate of change ofH with respect to tat 4 PM. 4000 H: 2 t +6 The instantaneous rate of change of H with reaped to t at 4 PM. is Wl(m2 41). (Round to the nearest tenth as needed.)