Choose Olive expressions that are equivalent to two one over two divided one two divided six

Ineed asap. i cant understand this question i need someone to me right away

Which statement is true about a number and its additive inverse? a. their product is always one. b. their sum is always one. c. they are always reciprocals of each other. d. their sum is always zero.

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?