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3 years ago

PLEASE HELP ASAP!!! ):

Mathematics

1 answer:

stiv31 [10]3 years ago

4 0

9514 1404 393

Answer:

see attached

Step-by-step explanation:

This is made slightly more difficult by the fact that the given polynomials are not in order of decreasing powers of x. So, you need to be careful what you're adding, to make sure the terms are "like".

Add: (-2x² +3x +4) +(x² -4x -5) = (-2+1)x² +(3-4)x +(4-5) = -x² -x -1

Opp: -(3x² -x +1) = 3x² +x -1

Sub: (x² +3x -4) -(-2x² +4x -3) = (1-(-2))x² +(3-4)x +(-4-(-3)) = 3x² -x -1

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Answer: Rogun dam is 335m tall and Nurek dam is 300m tall

Step-by-step explanation:

I will use $r$ to represent the height of the Rogun dam and $n$ to represent the height of the Nurek dam.

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From the second equation, we can rearange it to be:

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Then take this new value of $r$ and plug it into our first equation to find $n$

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This means that the Nurek dam is 300m tall, and the Rogun dam is 335m tall, found by pluggin the value into our first equation:

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