3 years ago

40 points and brainly math problem easy!

Mathematics

1 answer:

Nat2105 [25]3 years ago

8 0

Answer: the third one

Step-by-step explanation:

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What are the explicit equation and domain for a geometric sequence with a first term of 4 and a second term of −12?

Lerok [7]

$a_1=4;\ a_2=-12\\\\r=\dfrac{a_2}{a_1}\to r=\dfrac{-12}{4}=-3$

The formula of a geometric sequence:

$a_n=a_1\cdot r^{n-1}$

substitute

$a_n=4\cdot(-3)^{n-1}$

$The\ domain:\ \text{all integers where}\ n\geq1$

Answer: $\boxed{a_n=4(-3)^{n-1};\ \text{all integers where}\ n\geq1}$

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Step-by-step explanation:

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3 years ago

Please help with this

vovangra [49]

Answer:

x=35

Step-by-step explanation:

When a is parallel to b, the two angles will add to 180

x+ 3x+40=180

Combine like terms

4x+40 =180

Subtract 40 from each side

4x= 180-40

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Divide by 4

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4 years ago

David swam in 312 events during the last 6 years. He swam the same number of events each year.

natta225 [31]

Answer:

Step-by-step explanation:

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3 years ago

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Please help me with these 3 questions!

juin [17]

Answer:

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x=-2

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