IB MAI HL Functions Topic 2.2 Applications of Functions (id: 2ccc4a0fe)

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 subscription fee for an onloy/zzr oq ckd21y78 ;xzcg)h-ine projecr1fwig* y(x(pwa b bry,s-w ,*t management software by AB-Tech is $40$40 per month. If the customer buys for a whole year in advance, a discount of $130$130 is applied.
This can be modelled by the following function, P(n), which gives the total cost when paying annually for the subscription.
P(n)=40n−130,n≥12where n is the number months.
1.Find the total cost of buying a subscription for 2 years. P =    dollars
2.Find $P^{−1}$(1790). $P^{-1}$ =    months
The subscription price for a different online project management tool by YZ-tech is 35dollars per month, however customers can only purchase annually in advance, and there are no discounts. The total subscription cost of YZ-tech's software is less than AB-tech's software when n>k .
3.Find the minimum value of k. k =   

参考答案:
空格1: 830±2%  空格2: 48±2%  空格3: 26±2% 


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