2 years ago

PLEASE HELP ASAP Find the missing side lengths.

Mathematics

1 answer:

zimovet [89]2 years ago

8 0

You can see it’s 90

You can also see it because. A triangle is 180 degrees so

45+45=90

180-90=90

So x=90

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

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ANSWER

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

EXPLANATION

The given series is

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

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The expanded form is

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

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