Final answer:
The factor in the expression 624 – 4+9 (73 + 3) is 9 (73 + 3) if we assume there's a typo in the options and y2 should be 73.
Step-by-step explanation:
The question requires identifying which part of the given expression, 624 – 4+9 (73 + 3), is a factor. A factor is a number or expression that can be multiplied by another number or expression to get a third number or expression. To determine this, let's review the expression and consider which parts could be factors.
Option A, –4+9 (+ 3), is not a proper expression and or factor.
Option B, (18 + 3), doesn't appear in the given expression.
Option C, 624 – 4, is not a factor because this part of the expression is a subtraction rather than a multiplication.
Option D, 9 (y2 + 3) is indeed a factor, however, there seems to be a typo since 'y2' is not a part of the given expression. Assuming this is a typo and it should be '73' instead, 9 (73 + 3) is indeed a factor of the expression because 9 is multiplied by the entirety of (73 + 3).