Final answer:
The Distributive Property states that when you have a number outside parentheses multiplied by a sum or difference inside the parentheses, you can distribute the number to each term inside. In this case, the expression is (7+a)⋅8. Using the Distributive Property, you would multiply 8 by both 7 and a. So, the correct choice would be d) 15 + 8a.
Step-by-step explanation:
The Distributive Property states that when you have a number outside parentheses multiplied by a sum or difference inside the parentheses, you can distribute the number to each term inside. In this case, the expression is (7+a)⋅8. Using the Distributive Property, you would multiply 8 by both 7 and a. So, the correct choice would be d) 15 + 8a.