30 points! find the cube roots of 8(cos 216° + i sin 216°). also, if you wouldn't mind, while you're here could you answer some other questions i have posted? they are 10 points each and there about 5 of them : )

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Me find the value of x each figure.