Find the sum of the first 6 terms of the following sequence. Round to the nearest hundredth if necessary.72,68.4,64.98,…Sum of a finite geometric series:Sn=1−ra1−a1rnAnswer:
Q. Find the sum of the first 6 terms of the following sequence. Round to the nearest hundredth if necessary.72,68.4,64.98,…Sum of a finite geometric series:Sn=1−ra1−a1rnAnswer:
Find Common Ratio: First, we need to identify the common ratio r of the geometric sequence. We can find the common ratio by dividing the second term by the first term.Calculation: r=7268.4
Calculate Common Ratio: Now, let's perform the calculation to find the common ratio.Calculation: r=7268.4=0.95
Use Geometric Series Formula: Next, we will use the formula for the sum of the first n terms of a geometric series, which is Sn=1−ra1−a1⋅rn, where a1 is the first term, r is the common ratio, and n is the number of terms.We have a1=72, r=0.95, and n=6.
Substitute Values and Calculate: Now, we will substitute the values into the formula and calculate the sum of the first 6 terms.Calculation: S6=1−0.9572−72×0.956
Perform Calculation for Sum: Let's perform the calculation for the sum.Calculation: S6=(1−0.95)(72−72×0.956)=0.05(72−72×0.7350918906249995)
Calculate Exact Sum: Now, we will calculate the exact value of the sum.Calculation: S6=(72−52.92660998379997)/0.05=19.07339001620003/0.05=381.4678003240006
Round to Nearest Hundredth: Finally, we will round the sum to the nearest hundredth as instructed.Calculation: S6≈381.47