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4 years ago

Find S12 for the series 2 + 5 + 8 +...

2 answers:

7 0

Hi, I'm pretty sure by S12 you mean the sum of all the 12 terms in the series 2 + 5 + 8 + .....

Then, first you find the pattern:
5 -2 = 3
8 -5 = 3
This is an arithmetic series with a common difference of 3. Next, we find the last term, or the 12th term.

A12 = A1 + (n - 1)d
A12 = 2 + (12 - 1)3
A12 = 35

Since, we know the first and last terms of the series, we could find the sum by this formula:

S = (n/2)*(A1 + A12)
S = (12/2) * (2 + 35)
S = 222

The answer is 222.

olga55 [171]4 years ago

4 0

2+5+8+11+14+17+20+23+26+29+32+35

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4 years ago

If f(x)=3x+7, which of these is the inverse of f(x)

fgiga [73]

Answer:

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3 years ago

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Murrr4er [49]

Answer:

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Step-by-step explanation:

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4 years ago

Construct a line from A perpendicular to the x-axis, determine the distance from A to the x-axis along this perpendicular line,

Vaselesa [24]

Step-by-step explanation:

To determine distances, we need to use this formula: $d=\sqrt{(y_{2}-y_{1} ) ^{2} +(x_{2}-x_{1}) ^{2} }$

To apply that formula we need to use the coordinates of point, but in this case will be calculated generally, due to the lack of specific values.

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Applying the formula, the distance between this two points will be:

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To find an opposite and equidistant point, we only need to use opposite values. So, let's call Point B, the opposite point, its coordinates will be:

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And the distance will be the same, because squared values will always results positive.

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3 years ago

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AlekseyPX

Answer:

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2 years ago