[填空题]
The subscription fee for an online project manh bste,57 xa(ragement sr54rux s3 jtnn/f eo 86,c7jdooftware by AB-Tech is 40 dollars per month. If thef7 ctd34 so je5jo/n6r8xn,ru customer buys for a whole year in advance, a discount of 130 dollars 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). months
The subscription price for a different online project management tool by YZ-tech is 35 dollars 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.
