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anonymous
 one year ago
Evaluate S5 for 400 + 200 + 100 + … and select the correct answer below.
25
775
1,125
500
anonymous
 one year ago
Evaluate S5 for 400 + 200 + 100 + … and select the correct answer below. 25 775 1,125 500

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freckles
 one year ago
Best ResponseYou've already chosen the best response.1the series is geometric that is term/previous term equals 1/2 200/400=100/200=1/2 so 400 divided by 2 is 200 200 divided by 2 is 100 100 divided by 2 is 50 50 divided by 2 is 25 so you have your 5 terms... 400+200+100+50+25

freckles
 one year ago
Best ResponseYou've already chosen the best response.1you can also use the following formula: \[S_n=a \cdot \frac{1r^n}{1r} \\ \text{ where } n \text{ is the number of the terms } \\ a \text{ is the first number in the sequence } \\ r \text{ is the common ratio }\]
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