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igor_vitrenko [27]
3 years ago
12

Whats 1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9

Mathematics
2 answers:
k0ka [10]3 years ago
3 0

Answer:

90 is your answer

Step-by-step explanation:

first I just added all similar numbers together, then I added the answers of all the similar numbers together one-by-one, finally we find our answer, 90

nordsb [41]3 years ago
3 0

Answer:

Its 90

Step-by-step explanation:

I used a calc.....

1 + 1 + 2 + 2 + 3 + 3 + 4 + 4 + 5 + 5 + 6 + 6 + 7 + 7 + 8 + 8 + 9 + 9= 90

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Find the value of the term in the arithmetic sequence using an = a^1+ (n-1)d. 3,5,7,9,11, (8th term)
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<h3>Answer:  17</h3>

=========================================================

Work Shown:

a1 = 3 = first term

d = 2 = common difference (since we add 2 to each term to get the next one)

Let's compute the nth term.

an = a1 + (n-1)*d

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-----------------------

To check things so far, we can plug in something like n = 2

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a2 = 5

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That matches as well. I'll let you check the others.

-----------------------

Plug in n = 8 to find the 8th term

an = 2n+1

a8 = 2*8+1

a8 = 17

The eighth term is 17, which is the final answer.

-----------------------

You could extend out the given sequence by adding 2 each time until you reach the 8th term

3,5,7,9,11,13,15,17

Though this method is slow if you need to find say the 38th term

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Answer:

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Step-by-step explanation:

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A_2=\frac{1}{2}(8)(10)=40

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