so do all the question like this types
thankyou for your question
The law of cosines :
A^2 = B^2 + C^2 - 2BC cos A
2^2 = 3^2 + 4^2 - 2 . 3. 4 cos theta
= 21
hope this helps
Inital value= 35,000
depreciation value= .10 or 10%
value after 4 yrs= 22,963.5