Question

An office machine is purchased for $6000. Under certain assumptions, its salvage value, V, in dollars, is depreciated according to a method called double declining balance, by basically 71% each year, and is given by V(t) = 6000(0.71)^t, where t is the time in years after purchase.

Find V'(t)

Answer 1

should be easy once you recall that
d/dx a^x = a^x ln(a)