The sequence is: 4, 7, 12, 19, 28, A, 52. Differences increase by successive odd numbers (+3, +5, +7, +9, +11, +13). Compute A^2 − 4^2.

Introduction / Context:
We are given an increasing sequence and an expression to evaluate after finding the missing term. The intended operation sign is exponentiation: A^2 minus 4^2.

Given Data / Assumptions:

• Sequence: 4, 7, 12, 19, 28, A, 52.
• Successive differences: +3, +5, +7, +9, +11, +13 (odd numbers in order).
• Interpret “A 2 – 4 = ?” as A^2 − 4^2 under standard formatting recovery.

Concept / Approach:
Compute A using the difference pattern, then evaluate the requested expression with perfect squares.

Step-by-Step Solution:

Verification / Alternative check:
Using odd-number differences produces exact matches at each step, confirming A = 39.

Why Other Options Are Wrong:
They result from misreading the exponent or using A*2 − 4; the recovered exponent form is consistent with the options.

Common Pitfalls:
Missing the exponent indicator and interpreting as multiplication; always check difference patterns and option magnitudes.

Final Answer:
1505.