Observe the pattern: each new layer adds 4 squares.<br><br>&bull; Pattern 1: 1 square<br>&bull; Pattern 2: 1 + 4 = 5 squares<br>&bull; Pattern 3: 1 + 4 + 4 = 9 squares<br><br>Final Answer: Pattern 2 blank = 4; Pattern 3 blanks = 4, 4; total = 9