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An element with mass 910 grams decays by 
16.6% per minute. How much of the element is remaining after 20 minutes, to the nearest 1oth of a gram?
Answer:

An element with mass 910910 grams decays by 16.6% 16.6 \% per minute. How much of the element is remaining after 2020 minutes, to the nearest 11oth of a gram?\newlineAnswer:

Full solution

Q. An element with mass 910910 grams decays by 16.6% 16.6 \% per minute. How much of the element is remaining after 2020 minutes, to the nearest 11oth of a gram?\newlineAnswer:
  1. Understand Problem and Formula: Understand the problem and determine the formula to use.\newlineWe know that the element decays by 16.6%16.6\% per minute. This means that each minute, the element retains 100%16.6%=83.4%100\% - 16.6\% = 83.4\% of its mass from the previous minute. To find the remaining mass after 2020 minutes, we can use the formula for exponential decay:\newlineRemaining mass = Initial mass ×(1decay rate)time\times (1 - \text{decay rate}) ^ \text{time}\newlinewhere the decay rate is 16.6%16.6\% or 0.1660.166, and time is 2020 minutes.
  2. Convert Decay Rate: Convert the decay rate to a decimal and calculate the remaining percentage each minute.\newlineDecay rate as a decimal = 16.6%100=0.166\frac{16.6\%}{100} = 0.166\newlineRemaining percentage each minute = 10.166=0.8341 - 0.166 = 0.834
  3. Apply Exponential Decay: Apply the exponential decay formula to calculate the remaining mass after 2020 minutes.\newlineRemaining mass = 910910 grams ×(0.834)20\times (0.834)^{20}
  4. Calculate Remaining Mass: Calculate the remaining mass using the values from the previous step.\newlineRemaining mass = 910×(0.834)20910 \times (0.834)^{20}
  5. Perform Calculation: Perform the calculation.\newlineRemaining mass 910×(0.834)20910×0.04944.59\approx 910 \times (0.834)^{20} \approx 910 \times 0.049 \approx 44.59 grams
  6. Round Remaining Mass: Round the remaining mass to the nearest 1010th of a gram.\newlineRounded remaining mass = 44.644.6 grams

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