Lenny's car is worth $18,000 after 5 years. when the car was new, it sold for $24,000. what is the depreciation rate?

A=p (1-r)^t
18000=24000 (1-r)^5
Solve for r (rate of depreciation)
R=((18,000÷24,000)^(1÷5)−1)×100
R=−5.59 % per year

If you doing straight-line depreciation rate

(P-s)÷N

(24000-18000)/5=1200

where p is cost, s is sold or salvage value, N is number of years

To this question, we have to apply the Pythagorean Theory. a-square+b-square+c-square. We know that the side which says, the square root of 3, it would just be 3. The Hypotenuse is 6. So we apply the formula reverse. 3+n= 36, because 6 squared. 36-3= 33. The square root of 33 is 5.74456264654