2.2 Lösning 4c

$${\Delta y \over \Delta x} = {f(100) - f(90) \over 100 - 90} = {0,04\cdot 100 + 5 - (0,04\cdot 90 + 5) \over 10} =$$

$$= {4 + 5 - (3,6+5) \over 10} = {9 - 8,6 \over 10} = {0,4 \over 10} = 0,04$$