IB MAI HL Functions Topic 2.2 Applications of Functions (id: 1b070f32e)

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

[填空题]
The size of the trunk 4+fxq rlu (hi+9mc8i kdiameter of a chestnut oak treemt cqn0qzgr t02)8n+e , $d$, in centimetres, can be modelled by the function
$d(t)=9ln(0.25t)$,t≥5,where $t$ is the age, in years, of the tree.
1.Find the size of the trunk diameter of a 10-year-old chestnut oak tree. d =   
2.The size of the trunk diameter of a chestnut oak tree is 15 cm. Find its age. t =   
A chestnut oak tree can be harvested for wood when the size of its trunk diameter reaches 20 cm.
3.Find the age of the chestnut oak tree when it is old enough to be harvested for timber. t =   

参考答案:
空格1: 8.25±2%  空格2: 21.2±2%  空格3: 36.9±2% 


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