Question: A coin is heads up. Ka flips the coin. Sherrie flips the coin. Is the coin still heads up?
Answer: Let's think step by step.
The coin was flipped by Ka and Sherrie.
So the coin was flipped 2 times, which is an even number.
The coin started heads up, so after an even number of flips, it will still be heads up.
So the answer is yes.

Question: A coin is heads up. Jamey flips the coin. Teressa flips the coin. Is the coin still heads up?
Answer: Let's think step by step.
The coin was flipped by Jamey and Teressa.
So the coin was flipped 2 times, which is an even number.
The coin started heads up, so after an even number of flips, it will still be heads up.
So the answer is yes.

Question: A coin is heads up. Maybelle flips the coin. Shalonda does not flip the coin. Is the coin still heads up?
Answer: Let's think step by step.
The coin was flipped by Maybelle. 
So the coin was flipped 1 time, which is an odd number.
The coin started heads up, so after an odd number of flips, it will be tails up.
So the answer is no.

Question: A coin is heads up. Millicent does not flip the coin. Conception flips the coin. Is the coin still heads up?
Answer: Let's think step by step.
The coin was flipped by Conception.
So the coin was flipped 1 time, which is an odd number.
The coin started heads up, so after an odd number of flips, it will be tails up.
So the answer is no.

Question: A coin is heads up. Sal flips the coin. Raymond does not flip the coin. Is the coin still heads up?
Answer: Let's think step by step.
The coin was flipped by Sal. So the coin was flipped 1 time, which is an odd number.
The coin started heads up, so after an odd number of flips, it will be tails up.
So the answer is no.

Question: A coin is heads up. Conception flips the coin. Kristian does not flip the coin. Is the coin still heads up?
Answer: Let's think step by step.
The coin was flipped by Conception.
So the coin was flipped 1 time, which is an odd number.
The coin started heads up, so after an odd number of flips, it will be tails up.
So the answer is no.