Final answer:
The formula that can be copied and pasted is a = a + 4 because it increments the value of a by 4.
Step-by-step explanation:
"Copy and paste" is a common computer operation that allows users to duplicate content from one location and insert it into another. This functionality is widely used in text editing, document creation, and various applications across digital platforms.
The formula that can be used for this situation is a = a + 4.
When we substitute the values a = 51 and a = 55 into the formula, we get:
a = 51 + 4 = 55, and a = 55 + 4 = 59. So the values of a are correctly incremented by 4 using this formula.