Which of the lists of letters all have rotational symmetry? a. C, H, N, X

b. N, O, S, Z

c. H, J, N, S

d. F, H, X, Z

Pam buys a sleeve of ball bearings for her skateboard. each of the bearings is 1 1/5 inches wide. the sleeve is 9 3/5 inches long. how many ball bearings are in the sleeve? show your work.

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

Math question.. plz me .. best answer all