If f(x) = -(1/x^3) and x takes on successive values from -10 to 0.1 ,
Af(x) increases throughout
Bf(x) decreases throughout
Cf(x) increases, then decreases
Df(x) decreases, then increases
Af(x) increases throughout
Bf(x) decreases throughout
Cf(x) increases, then decreases
Df(x) decreases, then increases