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madreJ [45]
3 years ago
13

(5x + 2) + (4x + 5)​

Mathematics
1 answer:
Dmitrij [34]3 years ago
6 0

Answer:

9x+7

Step-by-step explanation:

This is because you combine like terms:

5x and 4x contain the same variable and amount of variables so you can combine them making 9x. You are then left with two numbers 5, and 2 they aren't attached to any variables and are in common in that way so you combine them too! This makes them 7, lastly you make it into an expression so you can't combine 9x and 7 so you leave it as 9x+7!!!

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fredd [130]

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The surface area of a shape is the amount of space on the shape

When the dimensions are quadrupled, the new surface area would be 16 times the initial surface area

<h3>How to determine the surface area</h3>

The surface area of a rectangular prism is:

S = 2 * (lw + lh + wh)

When quadrupled, we have:

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Substitute S = 2 * (lw + lh + wh)

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