exam Maths Puzzle Numerical Ability

A 1990 census report revealed that the mean distance that U. S. citizens live from their birthplace is 50 miles and that the standard deviation is 15 miles. A random sample of 49

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Hi, Can I please have some help finding the x and y intercepts of:
-2(x - 2)^4 + 8 , 3x^4 + 48 , and 3(x + 2)^3 (1-i)(2-i)/1-2i