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scoundrel [369]
2 years ago
5

What is the sum of the geometric sequence -3,18,-108,.. if there are 7 terms?

Mathematics
1 answer:
andreev551 [17]2 years ago
5 0

Answer:

S_{7} = - 119973

Step-by-step explanation:

The sum to n terms of a geometric sequence is

S_{n} = \frac{a(r^n-1)}{r-1}

where a is the first term and r the common ratio

Here a = - 3 and r = 18 ÷ - 3 = - 6 , thus

 S_{7}   = \frac{-3(-279936-1)}{-6-1}

    = \frac{-3(-279937)}{-7}

    = \frac{839811}{-7}

     = - 119973

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Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the corre
Scrat [10]

Answer:

4√(xy³)

Step-by-step explanation:

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6 0
2 years ago
Read 2 more answers
Multiple or divide as indicated 2x/4x+2 x 14 x+7/6
otez555 [7]
<span>2x/4x+2 x 14 x+7/6 is unclear.  Do you mean 2/4x, or do you mean  2x
                                                                                                           --------  ??
                                                                                                            4x+2
Use parentheses to make things clearer.

I will assume that you meant to write

   2x
--------- * 14x + 7/6
4x + 2

but am very much unsure if this is correct or not.



Perhaps you meant 

</span>2x/(4x+2) times 14(x+7/6)
<span>
This comes out as follows:

 2x * 14 (x + 7/6)        28x(x + 7/6)        14x(x + 7/6) 
------------------------ = ------------------- = --------------------
       4x+2                        2(2x + 1)              2x + 1         after reduction.

Performing the multiplication, we get            14x^2 + 98/6
                                                                     --------------------
                                                                              2x+1
</span>  

It appears that you're using "x" both as a variable name and as the "multiply" operator.  If so, please don't!  Use " * " to indicate multiplication.
<span>
</span>Please take and share a screen shot of this problem.
3 0
3 years ago
B
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====================================================

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Answer: True

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4 0
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