Awhole pie is cut into 8 equal slices. three of the slices are served. how much of the pie is left!

the translated point is (5,2)

answer is  

a.

5.56

hope you get this right.

in counting the number of heads in 4 coin flips, the probability that we get exactly one head is the probability that we get anyone of the following 4 outcomes: httt, thtt, ttht, or ttth. each has probability 1/16, so the probability to get exactly one head in 4 flips is 1/16 + 1/16 + 1/16 + 1/16 = 4/16 = 1/4.