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Z = (x-mu)/sigma or 3 = (x - 25)/6 or 18 = x - 25 or x = 42. So, for Z = 3, x = 42.
If: x2+16 = 25 Then: x = 3
32 + x = 259 + x = 25x = 25 - 9x = 16
x = 3
1 times 75 equals 75.