Mr turner bought stock for $15,000. if the value of the stock decreases 4% each year when will it be worth 80% of original price?

Step-by-step explanation:

we know that

In this problem we have a exponential function of the form

where

x is the time in years

f(x) is the value of the stock

a is the initial value

b is the base

r is the rate

b=(1-r)

we have

substitute

80% of original price is equal to

so

For f(x)=12,000 ------> Find the value of x

Apply log both sides

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^

fwms@lil_ben06

step-by-step explanation: