Karl bought a lawn mower for $450, and he charges customers $20 each to mow their lawns. he uses approximately $2 in gas for each lawn that he mows. how many lawns must he mow to break even?

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.