How the hell is the answer 6 or -4

one of the answers i get is -6 which is not the right one. where the heck does that -4 come from

If your score on your next statistics test is converted to a z score, which of these z scores would you prefer: minus2.00, minus1.00, 0, 1.00, 2.00? why? a. the z score of 2.00 is most preferable because it is 2.00 standard deviations above the mean and would correspond to the highest of the five different possible test scores. b. the z score of 0 is most preferable because it corresponds to a test score equal to the mean. c. the z score of minus2.00 is most preferable because it is 2.00 standard deviations below the mean and would correspond to the highest of the five different possible test scores. d. the z score of minus1.00 is most preferable because it is 1.00 standard deviation below the mean and would correspond to an above average

Given: prst square pmkd is a square pr = a, pd = a find the area of pmct.

Jack brought 12 pet monkeys. if each monkey cost $45.99, how much money did he spend in all?