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Thepotemich [5.8K]
3 years ago
9

Is an estimate of 8 as the difference between 4.7 and -3.3 reasonable? Explain.

Mathematics
1 answer:
iris [78.8K]3 years ago
3 0

\bf \underset{\textit{\large 3.3 + 4.7 = 8}}{\stackrel{\textit{3.3 units}}{\boxed{-3.3}\rule[0.35em]{10em}{0.25pt}}0\stackrel{\textit{4.7 units}}{\rule[0.35em]{17em}{0.25pt}\boxed{4.7}}}

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4 years ago
What is the sum of the series 3,---5,-13..........-229
Tpy6a [65]

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S_{30}= - 3390

EXPLANATION

The given sequence is

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The first term of this sequence is

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d =  - 5 - 3 =  - 8

The last term of this sequence is -229.

The nth term of this sequence is given by:

a_n=a_1+d(n-1)

We use the last term to determine the number of terms in the sequence.

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- 229  - 3=  - 8(n - 1)

- 232=  - 8(n - 1)

Divide through by -8;

29= (n - 1)

n = 30

Hence there are thirty terms in the sequence.

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S_n= \frac{n}{2} ( a_{1} + l)

The sum of the first 30 terms is given by:

S_{30}= \frac{30}{2} ( 3 +  - 229)

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3 years ago
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