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How to measure the full length of a coil of thin copper wire with a balance and ruler
First, measure the mass m of the coil of copper wire with a balance
Then measure the 1 meter copper wire with a ruler, cut it, and measure the weight m of the copper wire with a balance
Then M / M is the length of the copper wire
The sum of the squares of three x minus seven x minus four x minus three plus x
3x^2-7x-4x-3+x^2
=4x^2-11x-3
=(4x+1)(x-3)
The square of (16-x) is 49
(16-x)²=49
16-x=±7
x=16±7
x1=23,x2=9
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