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Find the sum of the first 6 terms of the following sequence. Round to the nearest hundredth if necessary.

72,quad68.4,quad64.98,dots
Sum of a finite geometric series:

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

Find the sum of the first 66 terms of the following sequence. Round to the nearest hundredth if necessary.\newline72,68.4,64.98, 72, \quad 68.4, \quad 64.98, \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 66 terms of the following sequence. Round to the nearest hundredth if necessary.\newline72,68.4,64.98, 72, \quad 68.4, \quad 64.98, \ldots \newlineSum of a finite geometric series:\newlineSn=a1a1rn1r S_{n}=\frac{a_{1}-a_{1} r^{n}}{1-r} \newlineAnswer:
  1. Find Common Ratio: First, we need to identify the common ratio rr of the geometric sequence. We can find the common ratio by dividing the second term by the first term.\newlineCalculation: r=68.472r = \frac{68.4}{72}
  2. Calculate Common Ratio: Now, let's perform the calculation to find the common ratio.\newlineCalculation: r=68.472=0.95r = \frac{68.4}{72} = 0.95
  3. Use Geometric Series Formula: Next, we will use the formula for the sum of the first nn terms of a geometric series, which is Sn=a1a1rn1rS_n = \frac{a_1 - a_1 \cdot r^n}{1 - r}, where a1a_1 is the first term, rr is the common ratio, and nn is the number of terms.\newlineWe have a1=72a_1 = 72, r=0.95r = 0.95, and n=6n = 6.
  4. Substitute Values and Calculate: Now, we will substitute the values into the formula and calculate the sum of the first 66 terms.\newlineCalculation: S6=7272×0.95610.95S_6 = \frac{72 - 72 \times 0.95^6}{1 - 0.95}
  5. Perform Calculation for Sum: Let's perform the calculation for the sum.\newlineCalculation: S6=(7272×0.956)(10.95)=(7272×0.7350918906249995)0.05S_6 = \frac{(72 - 72 \times 0.95^6)}{(1 - 0.95)} = \frac{(72 - 72 \times 0.7350918906249995)}{0.05}
  6. Calculate Exact Sum: Now, we will calculate the exact value of the sum.\newlineCalculation: S6=(7252.92660998379997)/0.05=19.07339001620003/0.05=381.4678003240006S_6 = (72 - 52.92660998379997) / 0.05 = 19.07339001620003 / 0.05 = 381.4678003240006
  7. Round to Nearest Hundredth: Finally, we will round the sum to the nearest hundredth as instructed.\newlineCalculation: S6381.47S_6 \approx 381.47

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