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To find AB, we need to use the Pythagorean theorem:
AB^2 = CB^2 + D to a^2
AB^2 = 6^2 + 14^2
AB^2 = 36 + 196
AB^2 = 232
AB = sqrt(232)
AB ≈ 15.2
Therefore, AB ≈ 15.2, rounded to the nearest tenth.