Apps. and Interpretation HL Practice Paper Book | Page 123

2 . The depth ( in metres ) of the water in a river on a particular day can be modelled by the function d �3.5sin ( 3 t) � 6 , where t is the number of minutes after 5 : 00 am .

( a ) Write down

( i ) the amplitude of d ;

( ii ) the maximum value of d ;

( iii ) the minimum value of d .

( b ) Find the period of d , giving the answer in minutes .

( c ) Write down the time for the third minimum value of d .

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