I think it’s 82 because 78+4=82
In the proportional theory,
28 units is the total measurement that includes 8 units.
So, 10 + 3x - 5 is the total measurement that includes 10 units proportionally.
This means,
28 = 10 + 3x - 5
Now solve for x,
28 = 10 + 3x - 5
28 - 10 = 3x - 5
18 + 5 = 3x
23 = 3x
23 / 3 = x
So x = 23/3 or 7.6666....
Answer:
a² + b² + c² ≠ ab + bc + ca
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The answer is 2^(9/10). I did it assuming with the ^5 you mean the 5th root of 4