Can someone pls help me with the middle one if you do thank you so much im having trouble on that on :((

Ten members of balin's soccer team ran warm ups for practice. each member ran the same distance. their combined distance was 5/6 of a mile. to find the distance that each member ran, balin wrote the expression below.

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.

Common binomial factor of 6x(3x+7)+5(3x+7)