Calculate the total number of trials for an absolute frequency of five trials and a relative frequency of 50 percent

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Which of the following is a solution of z^6 = 64i? 2(cos105° + isin105°) 2(cos120° + isin120°) 2(cos135° + isin135°) 8(cos15° + isin15°)

What’s the range cuz i can’t find it?