Question

y=10000*0.8^x if y is dollas and x is year. please help

Answer 1

\[y = 10000 * .8^x\]

Answer 2

yes. I could not solve that question

Answer 3

what are you trying to solve?

Answer 4

i could fine in percent/year

Answer 5

if y is money and x is year so hur big is cost in percent per year

Answer 6

@across

Answer 7

I am so confused. What are you trying to do? Solve for \(x\)?

Answer 8

yes

Answer 9

Do you know how to work with logarithms?

Answer 10

\[
y=10000\cdot0.8^x\\
\log_{0.8}y=\log_{0.8}10000+\log_{0.8}0.8^x\\
\log_{0.8}y=\log_{0.8}10000+x\\
x=\log_{0.8}y-\log_{0.8}10000\\
x=\log_{0.8}\frac{y}{10000}
\]

Answer 11

i do not know that. thats why i could not do that question also its not in the book :((

Answer 12

how to get the percent/year because i could not know the result of y