Answer:
a)  W(x)  =  2, 000  - 275 x  represents the given situation.
b) The cost of the computer after 6 years is $350.
Step-by-step explanation:
Initial worth of the company = $2,000
Depreciation each year = $275
Let, W(x) represent the worth of the computer in x - th year.
So, according to the question:
a)   W(x)  =  2, 000  - 275 x  represents the given situation.
b)  Solving W(x) for x = 6, we get
     W(6)  =  2,000  - 275(6)  = 2, 000  -  1,650
               = 350
⇒W(6)  = $350
Hence, the cost of the computer after 6 years is $350.