These are unrelated events, so simply multiply them. 3 in 6, or 0.5 for the die, and 1 in 2, or 0.5 for the coin, multiplied together gives you 0.25.
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The probability of a head is 1/2. The probability of an odd number is 1/2. 1/2 x 1/2 = 1/4 or 0.25
There are 36 possibilities when rolling two six sided die. 15 of them result in a prime number (2,3,5,7,11) So the probability is 15 in 36 or a 5 in 12 chance.
It is 2/3.
The probability of rolling a 2 is 1 in 6. The probability of rolling an even number is 3 in 6. The probability of doing both, on two rolls, is 3 in 36, or 1 in 12.
1/2 * 1/2 = 1/4 1/2= probability of landing an even number 1/2 = probability of landing a heads