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Dmend4
25.07.2019 •
Mathematics
An investment loses 2.3% of its value every week. find the half-life in this situation.
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Ответ:
The amount of an investment is given by
where A is the total amount, p is the amount invested, r is the interest rate as a decimal number, and t is the amount of time. In our case, we do not know the principal; r is -2.3% = -2.3/100 = -0.023; and we do not know t. We do know that we are trying to find when A, the amount of the investment, is equal to 1/2 of the principal; that means A = 0.5p:
We can divide both sides by p, which will cancel it on both sides:
To cancel the exponent t, we will use logarithms:
Ответ:
Step-by-step explanation:
Given function is y = 100 - x
Now, inverse function can be written as
switch the x and y variables
or, x = 100 - y
Then again y = 100 - x
So
Answer