a) the the iroc for f(x)= 3x is constant? b) the the iroc for g(x)= x^3 is decreasinf then increasing? c) the the iroc for h(x)= 3^x is increasing?
(a) f" = 0 so f' is constant (b) f" = 6x, so for x>0 f' is decreasing, and so on (c) f" is always positive, so f' is always increasing
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