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26 x 4 = (25 + 1) x 4 = 100 + 4 = 104
Assuming you mean the tangent at x = 4 of x² + y² = 26 then: x² + y² = 26 → y² = 26 - x² → y = √(26 - x²) → slope = dy/dx = d/dx √(26 - x²) = -x/√(26 - x²) At x = 4: slope = -4/√(26 - 4²) = -1.26491106.... ≈ -1.265
26 multiplied by 4 is 104.
6.5 x 4 = 26
(4/26) x 100 = 400/26 = 15.38%