What is b when b^2=46

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.

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders