Use the triangle angle-sum theorem and other angle relationships to find the missing angle measures

If you flip a coin 3 times, what is the probability of flipping heads 3 times? a. p(3 heads) = 3/8 b. p(3 heads) = 1/6 c. p(3 heads) = 1/8 d. p(3 heads) = 1/2

What’s the answer? and how do i solve it ?

Write each rational number in the form a/b, where a and b are integers. 1. 5 1/6 2. -12