Question

You purchase a cell phone for $125. the value of the cell phone decreases by about 20% annually. write a function at models the value of the cell phone overtime. then find the value of the cell phone after three years

Answer 1

f(x)=125-(125*0.2x)
to find the value of the phone after 3 years, you put x=3.
f(3)=125-(125*0.2(3))
f(3)=50