Which polynomial represents the sum below?

(18x2 - 18) + (-13x2 - 13x + 13)

a. 5x2 - 13x - 5

b. 31x2 - 31x - 5

c. 18x2 - 31x - 18

d. 5x2 - 13x - 31

Aprobability experiment is conducted in which the sample space of the experiment is s={7,8,9,10,11,12,13,14,15,16,17,18}, event f={7,8,9,10,11,12}, and event g={11,12,13,14}. assume that each outcome is equally likely. list the outcomes in f or g. find p(f or g) by counting the number of outcomes in f or g. determine p(f or g) using the general addition rule.