IB MAI HL Functions Topic 2.2 Applications of Functions (id: b8d07ead1)

本题目来源于试卷: IB MAI HL Functions Topic 2.2 Applications of Functions，类别为 IB数学

[问答题]
The water depth, D, in metres, in a harbour on a paraqitjr4 y7h4t5+zee ;vszr 55qf /9hxtdo-odv.p u5)uf -+z8 oyyjb*nicular day can be modelled by the equ)o-.8vd jypyz fon *dbu -5+ouation
D=2.5cos($30^{\circ}$$\times{t}$)+5,0≤t≤24,where t is the elapsed time, in hours, since midnight.
1.Draw the graph of D versus t on the grid below.





2.Find the lowest and highest depths of water in the harbour, and the times when they occur.
3.A large yacht has a draught of 3 metres. Decide whether the yacht will be able to enter the harbour at 5 pm.

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