a)
f(x) = a·b^x
f(5) = 3.9 --> a·b^5 = 3.9
f(13) = 34.2 --> a·b^13 = 34.2
Ich löse das Gleichungssystem und komme auf: a = 1.004 ∧ b = 1.312
f(x) = 1.004·1.312^x
b)
f(8) = 8.815
f(15) = 58.98
c)
f(x) = 100 --> x = 16.94
d)
f(x) = 0.15 + (6.9 - 0.15)/7·x = 0.9643·x + 0.15
f(5) = 4.9715
e)
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