3 years ago

I have a question with a mathematical problem that I have! If m

Mathematics

2 answers:

Rina8888 [55]3 years ago

7 0

Answer:

Your answer isnt completed so we arent able to help you. I would make a new one and so we can help :D

Step-by-step explanation:

emmainna [20.7K]3 years ago

6 0

I can help you. What do you need

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Montano1993 [528]

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3 years ago

Given the sequence in the table below, determine the sigma notation of the sum for term 4 through term 15

goblinko [34]

$a_n=5 \ for \ n=1 \\
a_n=-10 \ for \ n=2 \\
a_n=20 \ for \ n=3$

You can see it's a geometric sequence because the ratio is constant ( $\frac{a_3}{a_2}=\frac{a_2}{a_1}$ ).
The nth term of a geometric sequence:
$a_n=a_1 \times r^{n-1}$

$a_1=5 \\
r=\frac{a_2}{a_1}=\frac{-10}{5}=-2 \\ \\
a_n=5(-2)^{n-1}$

It has to be the sum for term 4 through term 15, so n=4 and the number above the sigma is 15.

Your answer:
$\sum^{15}_{n=4} 5(-2)^{n-1}$

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3 years ago

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