3 years ago

|18| what is the absolute value?

Mathematics

1 answer:

Tju [1.3M]3 years ago

7 0

The answer is 18, the answer is always just the number in the brackets( hope this helps)

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Find the sum of the series and show your process for finding each term leading to the final sum.

Crazy boy [7]

ANSWER

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EXPLANATION

The given series is

$\sum_{k=3}^5( - 2k + 5)$

This series is finite.

The expanded form is

$\sum_{k=3}^5( - 2k + 5) = ( - 2 \times 3 + 5) + ( - 2 \times 4 + 5) + ( - 2 \times 5 + 5)$

This simplifies to

$\sum_{k=3}^5( - 2k + 5) = ( - 6 + 5) + ( - 8+ 5) + ( - 10+ 5)$

$\sum_{k=3}^5( - 2k + 5) = ( - 1) + ( - 3) + ( - 5)$

$\sum_{k=3}^5( - 2k + 5) = - 9$

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