Write the first three terms of the geometric sequence that has a1= 120 and whose common ratio is r = -1/2

Mathematics

1 answer:

Alona [7]4 years ago

8 0

For geometric sequence, you multiply the common ratio to the previous one.

120 × (-1/2) = -60

-60 × (-1/2) = 30

30 × (-1/2) = -15

So your first three terms is

-60 , 30 , -15

Hope this helped! Brainliest is always welcome :)

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Answer:

Last Option

Step-by-step explanation:

We have a triangle and we know its three sides.

We want to find one of your anguos. Then we use the cosine theorem.

$c ^ 2 = a ^ 2 + b ^ 2 -2abcosx$

Where

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Now we solve for x from the equation

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