Higher June 2017 Paper 3 Q15

AQACurrent spec2 marksDrawing & Using Graphs

15 The graph shows the depth of water in a harbour for 12 hours.

\(d\) is the depth of water in a harbour in metres
\(t\) is the number of hours after 9 am

Graph of depth d in metres (0 to 8) against time t in hours (0 to 12). The curve starts at 6, rises to a maximum of 8 at t = 3, falls through 5 at t = 7 to a minimum of 4 at t = 9, then rises through 5 at t = 11 to 6 at t = 12
(a) For how many of the 12 hours is the depth more than 5 metres? [1 mark]
(b) By how much does the depth change between 12 noon and 4 pm? [1 mark]
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