Need help with matrices :/ 6. Given that the matrix is skew-symmetric, find the value of x+y+z

7. Find the value of x which makes the matrix symmetric

8. If is a symmetric matrix, what are the values of x, y, and z?

Asimple random sample of size nequals14 is drawn from a population that is normally distributed. the sample mean is found to be x overbar equals 70 and the sample standard deviation is found to be sequals13. construct a 90% confidence interval about the population mean

What is the domain and range of each function 1. x (3, 5, 7, 8, 11) y ( 6, 7, 7, 9, 14) 2. x (-3, -1, 2, 5, 7) y (9, 5, 4, -5, -7)

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300