本题目来源于试卷: IB MAI HL Functions Topic 2.3 Properties of Functions，类别为 IB数学
[问答题]
The ocean pressure, P, under sea level can be modeldf:fcx gl7u :;led by n9 krv0)e8n icthe function
$P(D)=\frac{D}{10}+1$
where D is the distance in metres below sea level and P is measured in atmospheres.
A submarine cruising near the surface is submerged according to the function
$D(t)=10+5t$
where t is measured in minutes and D is the distance the submarine is below sea level, measured in metres.
1.Find the composite function $P∘D$ and explain what it means in the
context of this question
2.Find and interpret $(P∘D)(10)$.
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