The length of a wall on a picture is 4 inches. The real wall is 72 inches long. What is the scale factor from the picture to the real wall? (How many times longer is the real wall?)
A.12
B.18
C.20
D.4

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.