Is the square root of negative 64 rational or irrational

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Aline parallel to a triangle's side splits ab into lengths of x - 5 and x + 2. the other side, ac, is split into lengths of x and x + 12. what is the length of ac? a) 12 b) 24 c) 36 d)

What fraction is equivalent to 0.46464646··· a. 46⁄999 b. 46⁄100 c. 46⁄99 d. 23⁄50