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sertanlavr [38]
3 years ago
10

Anyone know the right answer?

Mathematics
1 answer:
Paha777 [63]3 years ago
7 0
Begin by understanding the word "per"

Whatever follows per is on the denominator of the fraction

So it's cm/$ 
21.5 cm / 17.20 = 1.25 cm / dollars. 
It's an odd unit, but that's what it is. 
This is very expensive wire. Must be made of something like platinum.

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Since you don't provide the coordinates of the point W, I will help you in a general form anyway. In the Figure below is represented the segment that matches this problem. We have two endpoints U and V. So, by using the midpoint formula we may solve this problem:

Midpoint=W=W(\frac{x_{1}+x_{2}}{2}, \frac{y_{1}+y_{2}}{2})=W(x_{3}, y_{3}) \\ \\ where:\\ \ U=U(x_{1}, y_{1}) \ and \ V=V(x_{2}, y_{2}) \\ \\ and: \\ x_{3}=\frac{x_{1}+x_{2}}{2} \\ y_{3}=\frac{y_{1}+y_{2}}{2}

Therefore:

x_{2}=2x_{3}-x_{1} \\ y_{2}=2y_{3}-y_{1}

So we know x_{3} \ and \ y_{3} but we also must know x_{1} \ and \ y_{1}

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