The value of a textbook is $120 and decreases at a rate of 12% per year. write a function to model the situation and then find the value of the textbook after 9 years.

120(0.12) = $14.40

After the first deduction, the book now costs $105.60.

It decreases $14.40 per year.

Do this for 8 more years.

This should give you what you need to form the needed function modeling the situation.

(m+11n)^2=(m+11n)(m+11n)=m^2+11mn+11mn+121n^2=m^2+22mn×121n^2 for example; use foil: (a+b)(a+b)first. a^2outside. abinside. ablast. b^2