The mystery number is 8 or in decimal is 8538.01. hope its correct.
Complete the square for the given equation
x² - 2x + ____ + y² - 2y + _____ = 98
x² - 2x + (1) + y² - 2y + (1) = 98 + (1) + (1)
(x - 1)² + (x - 1)² = 100
(x - 1)² + (x - 1)² = 10²
Now the equation is in the form (x - h)² + (y - k)² = r²
Radius = 10
-2.8, -2.6, -2.3
Hope this helped :)
I am going to assume 2.5x is really 25x (typo).
First formulate the equality

Now two results emerge.
.
Hope this helps.
Answer:
10/3 or 3.33333
Step-by-step explanation:
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Hope this Helps