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Find the sum of the first 9 terms of the following sequence. Round to the nearest hundredth if necessary.

36,quad9,quad(9)/(4),dots
Sum of a finite geometric series:

S_(n)=(a_(1)-a_(1)r^(n))/(1-r)
Answer:

Find the sum of the first 99 terms of the following sequence. Round to the nearest hundredth if necessary.\newline36,9,94, 36, \quad 9, \quad \frac{9}{4}, \ldots \newlineSum of a finite geometric series:\newlineSn=a1a1rn1r S_{n}=\frac{a_{1}-a_{1} r^{n}}{1-r} \newlineAnswer:

Full solution

Q. Find the sum of the first 99 terms of the following sequence. Round to the nearest hundredth if necessary.\newline36,9,94, 36, \quad 9, \quad \frac{9}{4}, \ldots \newlineSum of a finite geometric series:\newlineSn=a1a1rn1r S_{n}=\frac{a_{1}-a_{1} r^{n}}{1-r} \newlineAnswer:
  1. Identify Sequence Type: To find the sum of the first 99 terms of the given sequence, we first need to identify the type of sequence. The sequence provided is a geometric sequence because each term is obtained by multiplying the previous term by a common ratio. To find this common ratio (r)(r), we divide the second term by the first term.
  2. Calculate Common Ratio: Calculate the common ratio rr:r=936r = \frac{9}{36}r=14r = \frac{1}{4}
  3. Use Geometric Series Formula: Now that we have the common ratio, we can use the formula for the sum of the first nn terms of a geometric series: Sn=a1a1rn1rS_n = \frac{a_1 - a_1 \cdot r^n}{1 - r} where SnS_n is the sum of the first nn terms, a1a_1 is the first term, rr is the common ratio, and nn is the number of terms.
  4. Find Sum of First 99 Terms: Plug the values into the formula to find the sum of the first 99 terms:\newlineS9=3636×(14)9114S_9 = \frac{36 - 36 \times (\frac{1}{4})^9}{1 - \frac{1}{4}}
  5. Calculate Numerator and Denominator: Calculate the numerator and the denominator separately:\newlineNumerator: 3636×(14)936 - 36 \times \left(\frac{1}{4}\right)^9\newlineDenominator: 1141 - \frac{1}{4}
  6. Calculate Denominator: Calculate the denominator:\newlineDenominator = 114=341 - \frac{1}{4} = \frac{3}{4}
  7. Calculate Numerator: Calculate the numerator:\newlineNumerator = 3636×(14)936 - 36 \times \left(\frac{1}{4}\right)^9\newlineSince (14)9\left(\frac{1}{4}\right)^9 is a very small number, we can use a calculator to find its value and then multiply it by 3636.
  8. Divide Numerator by Denominator: Using a calculator, we find:\newline(14)90.0000152587890625(\frac{1}{4})^9 \approx 0.0000152587890625\newlineNumerator =3636×0.0000152587890625360.0005488125= 36 - 36 \times 0.0000152587890625 \approx 36 - 0.0005488125\newlineNumerator 35.9994511875\approx 35.9994511875
  9. Calculate Final Sum: Now, divide the numerator by the denominator to find the sum:\newlineS9=35.9994511875(3/4)S_9 = \frac{35.9994511875}{(3/4)}\newlineS9=35.9994511875×(4/3)S_9 = 35.9994511875 \times (4/3)
  10. Round to Nearest Hundredth: Calculate the final sum:\newlineS935.9994511875×(43)S_9 \approx 35.9994511875 \times (\frac{4}{3})\newlineS947.99926825S_9 \approx 47.99926825
  11. Round to Nearest Hundredth: Calculate the final sum:\newlineS935.9994511875×(4/3)S_9 \approx 35.9994511875 \times (4/3)\newlineS947.99926825S_9 \approx 47.99926825Round the sum to the nearest hundredth:\newlineS948.00S_9 \approx 48.00

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