Sequence of transformations that are the inverse of rotating a figure 90° counterclockwise and then reflecting it over the x-axis.

a

step-by-step explanation:

2+2 obliviously is 4.

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.