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Let's denote the two numbers as x and y. We can set up a system of equations: x + y = 18 and x - y = 4. By solving this system simultaneously, we can find that x = 11 and y = 7. Therefore, the two numbers that add up to 18 and subtract to 4 are 11 and 7.
The two numbers that add to get 14 and multiply to -72 are 18 and -4. This is because 18 + (-4) = 14 and 18 * (-4) = -72. The key to finding these numbers is to recognize that their sum is positive and their product is negative, indicating that one number is positive and the other is negative.
The number exactly halfway between two numbers is found by taking the average of the two numbers. In this case, the average of 14 and 18 is (14 + 18) / 2 = 32 / 2 = 16. Therefore, the number exactly halfway between 14 and 18 is 16.