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katrin2010 [14]
3 years ago
10

Please help with this

Mathematics
1 answer:
Aleksandr-060686 [28]3 years ago
6 0

Answer:

A

Step-by-step explanation:

(3x -14) + 9x is 90 degrees, so if you add 90 it becomes 180 degrees

It is 90 degrees because you can see that there is a right angle there

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Simplify each expression. 6mn3 -mn2 + 3mn3 +15mn2??
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Step-by-step explanation:

6m(n)^3 - m(n)^2 + 3m(n)^3 + 15m(n)^2

=> 6m(n)^3 + 3m(n)^3 + 15m(n)^2 - m(n)^2

=> 9m(n)^3 +14m(n)^2

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Answer:

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Step-by-step explanation:

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Part B's Steps:

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