(a)[1]
The temperature was $-2\,^{\circ}\text{C}$. It then falls by $8\,^{\circ}\text{C}$. Find the temperature after the change.
(b)[1]
On a different day, the temperature rises from $-5\,^{\circ}\text{C}$ to $3\,^{\circ}\text{C}$. Calculate the increase in temperature.