3 years ago

Write -2 + 4 + -8 + ...+ 64 +-128 in sigma notation. Then determine the sum.

Mathematics

1 answer:

Grace [21]3 years ago

4 0

It would be -70. Your welcome

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mariarad [96]

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What is the missing numerator? blank over five plus eighteen over twenty equals thirty over twenty 8 5 3 2

Oliga [24]

Given:

$\dfrac{?}{5}+\dfrac{18}{20}=\dfrac{30}{20}$

To find:

The missing value.

Solution:

Let x be the missing value.

We have,

$\dfrac{x}{5}+\dfrac{18}{20}=\dfrac{30}{20}$

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Subtract $\dfrac{9}{10}$ from both sides.

$\dfrac{x}{5}=\dfrac{3}{2}-\dfrac{9}{10}$

$\dfrac{x}{5}=\dfrac{15-9}{10}$

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Multiplying both sides by 5, we get

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So, the missing value is 3.

Therefore, the correct option is C.

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