What is value of the expression -2r/5s if r = -1/4 and s = 4/5?
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Using exponential function concepts, it is found that the daily rate of change in the mass of the sample is of -4%, that is, the amount decays by 4%.
<h3>What is an exponential function?</h3>A decaying exponential function is modeled by:
In which:
- A(0) is the initial value.
- r is the decay rate, as a decimal.
In this problem, the function is:
Hence:
1 - r < 1, hence the rate is negative, and the daily rate of change in the mass of the sample is of -4%.
You can learn more about exponential function concepts at brainly.com/question/25537936