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tiny-mole [99]
3 years ago
8

When did the tectonic history of the Appalachian Mountains begin?

Social Studies
1 answer:
Nezavi [6.7K]3 years ago
5 0

Answer:

480 million years ago

The Appalachians first formed roughly 480 million years ago during the Ordovician Period, and once reached elevations similar to those of the Alps and the Rocky Mountains before they were eroded.

Explanation:

so b is your answer

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Mandy used the input and output in this table to write ratios. She concluded that because they are not all equivalent, this is n
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Answer with Explanation:

Provided that Mandy's Table is this.

[ x ][ 1 ][ 2 ][ 5 ][ 10 ]

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

[ y ][ 5 ][ 10 ][ 25 ][ 50 ]

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"Proportional relationship" refers to<em> an equal set of ratios</em> in a statement or a table which shows <em>"equivalent ratios."</em>

As seen in Mandy's table, the last set if ratio is not equivalent to the other set of ratios because Mandy has incorrectly written the ratio. Instead of \frac{50}{10}, she wrote \frac{10}{50}. So, this makes it not equivalent to \frac{5}{1}.

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So, this explains the answer.

6 0
3 years ago
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