Find (f*g)(x) when f(x)=x^2-7x+12 and g(x)=7/x^2-16

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