## anonymous 5 years ago please help in 1980, your car was worth $25,000, now in 2010 your car is worth$13,000. What is the annual decay rate?

1. anonymous

What is the definition of rate?

2. anonymous

If you dont know please tell me.

3. anonymous

i dont know what it means

4. anonymous

Rate is change of something over a time interval

5. anonymous

usually its written like this$\Delta Value /\Delta time$

6. anonymous

by how much did the car value went down?

7. anonymous

is that what the rate is

8. anonymous

thats the equation of rate yes

9. anonymous

so what numbers do you plug in to solve it

10. anonymous

$\frac {d _{1}- d _{0}}{t _{1}-t _{0}}$ d1= final value of car d0= initial value of car t1= final year t0= initial year

11. anonymous

thanks