Answer:
D
Explanation:
1) rewrite 7 plus as
7 +
2) rewrite “the product of 9 and a“ as
9a remembering that a product can be written without a sign that indicates the operation
3) match the two informations
7 + 9a
4) rewrite “is 7” as:
= 7
5) write the final expression
7 + 9a = 7