Step 1. So the first derivative of h(t) or h'(t) is the rate of change of h(t) with respect to t.
First derivative of h(t) = h'(t) =
Step 2. At t=2, then h'(t)=2*2+11 = 15.
Step 3. The instantaneous rate of change of h(t) = h'(t) = 15.
I hope the above steps were helpful.
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