Draw all of the diagonals from one vertex in each of these polygons.

d is ur answer hopes this i dont really know how to explain it to u.

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.

i think you forgot some signs inbetween? if so comment and i'll try to