Answer:

Step-by-step explanation:
GIVEN: In
, a laptop computer was purchased for
. Each year since, the resale value has decreased by
. Let
be the number of years since
.
TO FIND: Let
be the value of the laptop computer, in dollars. Write an exponential function showing the relationship between
and
.
SOLUTION:
value of laptop in

decrease in resale value each year 
resale value of laptop after each year 
resale value after one year 
Now,

Hence relation between value of the laptop computer and time is
