To solve the problem, we first identify patterns in the given rows:
Row 1: 3, 15, 35, 63
These are products of consecutive odd numbers:
3 = 1×3,
15 = 3×5,
35 = 5×7,
63 = 7×9.
Row 3: 7, 28, 63, 112
Each term = leftmost number × (column index)2:
7×12=7, 7×22=28, 7×32=63, 7×42=112.
Row 4: 9, 36, 81, 144
Same pattern: 9×12=9, 9×22=36, 9×32=81, 9×42=144.
Row 2 leftmost number = 5. Following the pattern of rows 3/4 (leftmost number × column index2):
5×12=5, 5×22=20, 5×32=45, 5×42=80.
Though the given last term (90) seems off, the intended pattern for the missing term is 5×32=45.
Answer: 45
$\boxed{45}$
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