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The first three terms of a sequence are given. Write your answer as a decimal or whole number. Round to the nearest thousandth (if necessary).

5,4,(16)/(5),dots
Find the 10th term.
Answer:

The first three terms of a sequence are given. Write your answer as a decimal or whole number. Round to the nearest thousandth (if necessary).\newline5,4,165, 5,4, \frac{16}{5}, \ldots \newlineFind the 1010th term.\newlineAnswer:

Full solution

Q. The first three terms of a sequence are given. Write your answer as a decimal or whole number. Round to the nearest thousandth (if necessary).\newline5,4,165, 5,4, \frac{16}{5}, \ldots \newlineFind the 1010th term.\newlineAnswer:
  1. Determine Pattern: To find the 10th10^{\text{th}} term of the sequence, we first need to determine the pattern or rule that the sequence follows. We can start by looking at the differences between consecutive terms.
  2. Identify Differences: The difference between the first term 55 and the second term 44 is 1-1. The difference between the second term 44 and the third term 165\frac{16}{5} is 1654=165205=45\frac{16}{5} - 4 = \frac{16}{5} - \frac{20}{5} = -\frac{4}{5}. This suggests that the sequence might be an arithmetic sequence with a common difference of 15-\frac{1}{5}.
  3. Confirm Arithmetic Sequence: To confirm that the sequence is arithmetic with a common difference of 15-\frac{1}{5}, we can check the difference between the third term 165\frac{16}{5} and what would be the fourth term if we subtract another 15-\frac{1}{5} from the third term. The fourth term would be 16515=155=3\frac{16}{5} - \frac{1}{5} = \frac{15}{5} = 3. This confirms our pattern, as the difference is indeed 15-\frac{1}{5}.
  4. Apply Formula: Now that we have established that the sequence is arithmetic with a common difference of 15-\frac{1}{5}, we can use the formula for the nnth term of an arithmetic sequence: an=a1+(n1)da_n = a_1 + (n - 1)d, where ana_n is the nnth term, a1a_1 is the first term, nn is the term number, and dd is the common difference.
  5. Calculate 1010th Term: We are looking for the 1010th term a10a_{10}. We know that a1=5a_1 = 5 and d=15d = -\frac{1}{5}. Plugging these values into the formula, we get a10=5+(101)(15)a_{10} = 5 + (10 - 1)(-\frac{1}{5}).
  6. Round to Nearest Thousandth: Calculating the 1010th term, we have a10=5+9(15)=595=51.8=3.2a_{10} = 5 + 9(-\frac{1}{5}) = 5 - \frac{9}{5} = 5 - 1.8 = 3.2.
  7. Round to Nearest Thousandth: Calculating the 1010th term, we have a10=5+9(15)=595=51.8=3.2a_{10} = 5 + 9(-\frac{1}{5}) = 5 - \frac{9}{5} = 5 - 1.8 = 3.2.Since the problem asks us to round to the nearest thousandth if necessary, and our answer is already to the nearest tenth, no further rounding is required. The 1010th term of the sequence is 3.23.2.

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