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Reptile [31]
3 years ago
11

Guys help me out please and thanks :)

Mathematics
1 answer:
Jobisdone [24]3 years ago
5 0
The answer is D. BC 

To find an opposite of an angle, it will always be a line, not an angle.
The line that is directly opposite from the angle A is line BC.
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\large\boxed{(x^2+43x+10)-(10x^2-5x+10)=-9x^2+48x}

Step-by-step explanation:

(x^2+43x+10)-(10x^2-5x+10)\\\\=x^2+43x+10-10x^2-(-5x)-10\\\\=x^2+43x+10-10x^2+5x-10\qquad\text{combine like terms}\\\\=(x^2-10x^2)+(43x+5x)+(10-10)\\\\=-9x^2+48x

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