Question

A new 13.3'' Macbook Pro costs $1,200.00, and a one year old 13.3'' Macbook Pro costs $1,000.00. How do I make an exponential decay model with this?

Answer 1

Do you have the exponential decay formula I have forgotten it

Answer 2

I jsut need to see the formula I dont need to know what the variables mean

Answer 3

I think it's y=a(1-r)t

Answer 4

Ugh deleted what I wrote.


D = Pe^(rt)

P =1200.00
D=1000.00
t = 1 year
r = ? (Rate)

solve for r

Answer 5

I assume you know how to use logirthms to solve this

Answer 6

oops the equation is

D = Pe^(-rt)

Answer 7

I forgot what that is.

Answer 8

ln(D/P) = ln(e^(-rt))

Answer 9

does that help?

Answer 10

sorry but no it doesn't.

Answer 11

Logrithmic rules
1) log_b(mn) = log_b(m) + logb(n)

2) log_b(m/n) = log_b(m) – logb(n)

3) log_b(m^(n)) = n · log_b(m)

4) log_3(3) = 1

5) log_e(x) = ln(x)

6) log(x) = y is the same as x =10^(y)

7) log_10(x) = log(x)

Answer 12

Does that help?

Answer 13

Log_3(x) =\[\log_3(x)\]

Answer 14

Yes it does. Thanks.

Answer 15

if you want me to check your answer I can do that as well

Answer 16

no it's okay.

Answer 17

ok then back to the grind for me