Igot 2 questions. 1. in triangle abc, find b, to the nearest degree, given a=7, b=10, and c is a right angle. 2. solve the right triangle abc with right angle c if b=30 and c=10

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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.