If and are odd integers, and is even, which of the following must be an odd integer?

The operation ¤ is defined for all integers x and y as: x ¤ y = 4x-y2.

If x and y are positive integers, which of the following cannot produce an odd value?

If m, n and p are odd integers, which of the following must be an odd integer?

What is the 65th odd number?

At a certain high school, everyone must take either Latin or Greek. There are more students taking Latin than there are students taking Greek. If there are students taking Greek, how many total students are there?