ella3714
03.02.2020 •
Mathematics
What is the 20th term of the sequence -3, 6, -12, 24
the answer is 1,572,864 i just need to know the math in order to obtain the answer.
will give brainliest
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Ответ:
-1,572,864
Step-by-step explanation:
notice that each new term is found by multiplying the previous term by -2. Thus, the common ratio is -2. The first term is -3.
The general formula for a geom. sequence is a(n) = a(1) · r^(n-1), where r is the common ratio and a(1) is the first term.
In this problem,
a(20) = -3 · (-2)^(20 - 1), or
= -3 · (-2)^19, or
= -3 · 524288, or
= -1,572,864 (Note: this is negative)
Ответ:
14.4
Step-by-step explanation: