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An element with mass 570 grams decays by 
15.2% per minute. How much of the element is remaining after 16 minutes, to the nearest 1oth of a gram?
Answer:

An element with mass 570570 grams decays by 15.2% 15.2 \% per minute. How much of the element is remaining after 1616 minutes, to the nearest 11oth of a gram?\newlineAnswer:

Full solution

Q. An element with mass 570570 grams decays by 15.2% 15.2 \% per minute. How much of the element is remaining after 1616 minutes, to the nearest 11oth of a gram?\newlineAnswer:
  1. Understand the problem: Understand the problem and determine the formula to use.\newlineWe know that the element decays by 15.2%15.2\% per minute. This means that each minute, the element retains 100%15.2%=84.8%100\% - 15.2\% = 84.8\% of its mass from the previous minute. To find the remaining mass after 1616 minutes, we will apply the decay percentage repeatedly for 1616 times.
  2. Convert to decimal: Convert the decay percentage to a decimal to use in calculations.\newline15.2%15.2\% as a decimal is 15.2100=0.152\frac{15.2}{100} = 0.152. Therefore, the remaining percentage as a decimal is 10.152=0.8481 - 0.152 = 0.848.
  3. Calculate remaining mass: Calculate the remaining mass after each minute.\newlineWe will use the formula for exponential decay, which is:\newlineRemaining mass = Initial mass ×(1decay rate)number of time periods\times (1 - \text{decay rate})^{\text{number of time periods}}\newlineIn this case, the initial mass is 570570 grams, the decay rate is 0.1520.152, and the number of time periods is 1616 minutes.
  4. Perform calculation: Perform the calculation using the formula.\newlineRemaining mass after 1616 minutes = 570×(0.848)16570 \times (0.848)^{16}
  5. Calculate exact value: Calculate the exact value using a calculator.\newlineRemaining mass after 1616 minutes 570×(0.848)16570×0.04927.93\approx 570 \times (0.848)^{16} \approx 570 \times 0.049 \approx 27.93 grams
  6. Round the result: Round the result to the nearest tenth of a gram.\newlineThe remaining mass after 1616 minutes, rounded to the nearest tenth of a gram, is approximately 27.927.9 grams.

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