DUE IN 3 MINUTES PLEASE HELP

Mathematics

1 answer:

Dmitry [639]3 years ago

3 0

Answer:

B. 12^3 - 12^2 - 11

Step-by-step explanation:

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3 years ago

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3 years ago

ANSWER QUICKLY

denis23 [38]

The answer is 1/3 because I just took the test

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12) Find the sum, S7 for the geometric series {1 + 5 + 25 + - + 15625).

zhenek [66]

<u>Understanding:</u>

The sum of a geometric series is, $a+ar+ar^2+ar^3+...$ , with a being the start point and r is the common ratio. We can also use the following formula to make life easier $S_n=a\frac{1-r^n}{1-r}$ , a is your start point, r is the common ratio, and n is the number of terms, which in our case is S7.