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Sedbober [7]
2 years ago
11

Consider the series 4 + 12 + 36 ... Find the sum of the first 9 terms.​

Mathematics
1 answer:
jeyben [28]2 years ago
3 0

Answer:

39364

Step-by-step explanation:

You can simplify the equation to make 4(1+3+9...) The nth term is therefore 3^{n-1} so u can substitute that into the equation so 4(3^{n-1}+ 3^{n}  + 3^{n+1}..). This would simplify to 4(3^0 +3+3^2+3^3+3^4+3^5+3^6+3^7+3^8). By simplifying this, you can make it so 4(2^2+6^2+18^2+42^2+81^2) = 4(4+36+324+2916+6561) =39364

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galben [10]
The answer would be 1/3. You have to work backwarda for this problem. You start off by subtracting 5/4 - 3/4 =2/4 which simplifies to 1/2. Then, you have to add 1/6. Using the greatest common denominator, you have 3/6 + 1/6=4/6 which simplifies to 2/3.
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3 years ago
Solve the quadratic equation 2x + x-7 = 0<br> Give your answers to 2 decimal places.
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2 years ago
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lara [203]

Answer:

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Step-by-step explanation:

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2 years ago
What is the length of the unknown side?
pogonyaev

Answer:

10

Step-by-step explanation:

pythagorean theorem

8^2+6^2=c^2

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3 0
3 years ago
Read 2 more answers
The cost for a pack of 7 padlocks to $23.80. Find the unit price in dollars per padlock. If necessary, round your answer to the
Galina-37 [17]

It asks to "Find the unit price in dollars per padlock"

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In other words, the teacher wants to know how much 1 padlock costs.

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