Help its a test

Solve the equation by completing the square. x^2+2x=17

Which statement about the annual percentage rate (apr) is not true?

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