IB MAI HL Functions Topic 2.2 Applications of Functions (id: 7d96fa95a)

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 number of French 9ekm)4 9wskz ozyazoo718u)qr;iva p 1c o4-c(gk w0bnlan2 +words, N, that are remembered by students after the completion of a French language course decreases expon bn2ngw k0l(a+entially over time. This data can be modelled by the function
N(t)=a$\times$b$^{-t}$+450,​where a and b are positive constants, and t is the time in years since a student completed the French language course.
Immediately after completion, a student remembers 4200 French words.
1.Find the value of a. a =   
After 4 years a student remembers only 1600 French words.
2.Find the value of b. b ≈   
The number of French words a student remembers never decreases below a certain number of words, n.
3.Write down the value of n. n =   

参考答案:
空格1: 3750±2%  空格2: 1.34±2%  空格3: 450±2% 


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