1. The height,$h$ m , of water in a reservoir is modelled by the function

$h(t)=A+Bsin(\frac{ \pi }{6}t),t\geq0$

where $t$ is the time in hours after midnight. $A$ and $B$  are positive constants.

In terms of $A$ and $B$, write down the natural height of the water in the reservoir, as well as its maximum and minimum heights.