Apps. and Interpretation for IBDP Maths Ebook 1 | Page 152

Your Practice Set – Applications and Interpretation for IBDP Mathematics
(b)
Find the value of
(i) p ;
(ii) q ;
(c)
(iii) r .
[7]
There are two low tides on 9 April 2018. At what time does the second low tide
occur?
[3]
2. The height of the water in metres is modelled by the function h( t) � �pcos( qt)
� r ,
where p , q and r are positive, and t is the number of hours after 12 hours on 23
August 2018, for 0 �t
� 72 .
The point A (6.5, 4.2) represents the first high tide and B (13,1.8) represents the next low
tide.
(a) (i) How much time is there between the first high tide and the next high
tide?
(b)
(ii)
Find the difference in height between low tide and high tide.
Find the value of
[4]
(i) p ;
(ii) q ;
(c)
(iii) r .
Find the time when the second low tide on 25 August 2018 occur.
[6]
[3]
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