00:01
Hello everyone, we need to find the sale during the year 0.
00:06
That is, we are given with the function s of x is equal to 1000 minus 800, e power minus x.
00:14
So we need to substitute x is equal to 0 here.
00:18
We would get s of 0 is equal to 1 ,000 minus 800.
00:24
So the value of this is equal to 200.
00:27
That is, the sale of the compact disc player during the year 0 is 200.
00:34
Next, we need to find the number of years required for the sales to reach 900.
00:43
So we need to find the value of x when s of x is equal to 900.
00:50
So, 900 is equal to 1000 minus 800 into e power minus x.
00:59
So, evaluating this, we would get e power minus x is equal to 100 by 800, or the value of e power minus x is equal to 0 .125...