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Another tricky 1.....
try this for size :
_________________________________________________________________
the depth, D metres, of the water at the end of a jetty in the afternoon can be modelled by the formula
D= 5.5 + A sin30(t-k)°
t hours is the number of hours after midday
A and k are constants
yesterday the low tide was at 3 pm
the depth of the water at low tide was 3.5 m
find A and k
_________________________________________________________________
so i got 3.5 = 5.5 + A sin30(3-k)°
-2 = A sin 30 (3-k)°
_________________________________________________________________
the depth, D metres, of the water at the end of a jetty in the afternoon can be modelled by the formula
D= 5.5 + A sin30(t-k)°
t hours is the number of hours after midday
A and k are constants
yesterday the low tide was at 3 pm
the depth of the water at low tide was 3.5 m
find A and k
_________________________________________________________________
so i got 3.5 = 5.5 + A sin30(3-k)°
-2 = A sin 30 (3-k)°
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