Answer:
D
Step-by-step explanation:
When something depreciates completely, it will have a total value of 0 dollars. Therefore, set the equation to zero and solve for <em>t</em> to find the years.

Therefore, the table saw will completely depreciate after 9 years.
Tax is 4%
Tax in the $140 item is $5.60
(0.04x140)
0.69x+4.32=0.46x+3.4
-3.4 -3.4
____________________
0.69x+0.92=0.46x
-0.69x -0.69x
______________
0.92=-0.23
multiply by -100/23 multiply by -100/23
x=-4
Get rid of all common factors.
36/4 = 9
x^9/x^7 = x^2
y^4/y^3 = y