; t = a, t = a + h
Please note that the rate r of change is:
1) function g(x) = 1/x
r = [g(1)-g(a)] / (a-1) = (1 - 1/a) / (1-a) = -1
2) function g(x) = 3/(x+6)
r = [g(h) -g(0)] / (h-0) = [3/(h+6) - 3/6] / h = -1/(2*(h+6))
3) function f(t) = 3/t
r = [f(a+h)-f(a)]/(a+h-a) = [ 3/(a+h)- 3/a] / h=
r = -3/(a*(a+h))
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