$\bf \qquad \qquad \textit{sum of a finite geometric sequence} \\\\ S_n=\sum\limits_{i=1}^{n}\ a_1\cdot r^{i-1}\implies S_n=a_1\left( \cfrac{1-r^n}{1-r} \right)\quad \begin{cases} n=n^{th}\ term\\ a_1=\textit{first term's value}\\ r=\textit{common ratio}\\ ----------\\ r=-0.25\\ a_1=256\\ n=9 \end{cases}$

$\bf S_9=256\left(\cfrac{1-(-0.25)^9}{1-(-0.25)} \right)\implies S_9=256\left( \cfrac{1+0.25^9}{1+0.25} \right) \\\\\\ S_9=256\left( \cfrac{52429}{65536}\right)\implies S_9=\cfrac{52429}{256}\implies S_9=204.80078125$

4 0

3 years ago

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In a race, 41 out of the 50 bicyclists finished in less than 38 minutes. What percent of bicyclists finished the race in less th

storchak [24]

For left put 2 on each
On the box over 100 put 82, and put 82 in the box on the right

5 0

3 years ago

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Good points... just answer the question correctly

NeTakaya

Answer:

R'(-9,4) --------------- R'(9,-4)

Step-by-step explanation:

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3 years ago

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Jim and Carla are scuba diving. Jim Started out 10 feet below the surface. he descends 18 feet, rose 5 feet, and descended 12 mo

Viefleur [7K]

Carla rested at: -33

Jim rested at: -35

Now it is up to you to figure who was at the greater depth. I did the calculations for you all you have to do is compare:)))) GOOD LUCK its not hard now

6 0

3 years ago

Determine the intercepts of the line. y-intercept: (___, ___) x-intercept: (___,___)

Determine the intercepts of the line. y-intercept: (_, _) x-intercept: (_,_)