how to solve exponential growth and decay

label Algebra
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a new car that sells for $18,000 depreciates 25% each year. write a function that models the value of the car. find the value of the car after 4 years

Apr 30th, 2015

 Let  the variable of time is  t and the prix is x so 

f(t) = x - x * 0.25*t  so we have   x = 18 000$ 

so f(t) = 18 000 - 18 000 * 0.25 * t = 18 000 - 4 500 * t 

so the function is  f( t )= 18 000 - 4 500 * t

we have a car depreciates 25% each year so  18 000 * 0.25 =  4 500 

so the prix of the car reduce with average of 4 500$ each year so 

after 4 years the value of the car is 18 000 - 4 500 * 4 = 0 $ 

Good Luck and if you don't understand something please write it in the comment down 

and if you have an other homework please call me first i will give you the best solution 

 

May 1st, 2015

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Apr 30th, 2015
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Apr 30th, 2015
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