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Ilya [14]
3 years ago
6

Find the sum of the first 12 terms of the geometric sequence - 2,6,-18,54,-162....​

Mathematics
1 answer:
nekit [7.7K]3 years ago
6 0

Answer:

Sure, the common difference is -3, but like you have to multiple it and stuff, so it goes like this: -2,6,-18,54,-162,486,-1458,4374,-13122,39366,-118,098,354294.

So then, add all of the 12 terms I stated, and that will equal to 265,720

Therefore, the sum of the first 12 terms of that geometric sequence is 265,720.

Step-by-step explanation:

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8 0
3 years ago
Need help with a math question
Margaret [11]

Answer:

90 sq inches

Step-by-step explanation:

The lateral area is the side area of the pyramid. In this case, there are 3 sides because the base is a triangle.  Since the base is an equilateral triangle, all sides are of equal dimensions.  So, the sides of the pyramid are also all of the same size, area.

We then just have to figure out the area of one of the side triangles, then multiply it by 3 to get the total lateral area of that pyramid.

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In this case, b = 5 in, h = 12 in. So,

TA = (5 * 12)/2 = 60 / 2 = 30

Each side triangle has an area of 30 sq inches.

LA = 3 * TA (since there are 3 sides)

LA = 3 * 30 = 90 sq inches

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3 years ago
how many license plates can you make when a license plate consists of 6 out of 26 alphabetical letters each of which can be repe
UkoKoshka [18]
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4 years ago
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Answer:

12/19?

11/19?

Step-by-step explanation:

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3 years ago
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