They have the same slope because they are similar. The smaller one is 1/2 the size of the bigger one and they have a ratio of 1:2 which makes them similar.
The probability of spinning a prime number and not flipping heads will be given as follows: P(Prime)*P(Tails) P(Prime)=3/5 P(Tails)=1/2 Thus P(Prime) and P(Tails) =3/5×1/2 =3/10
