Final answer:
Marcia spent $2.25 for each pair of socks after calculating the total cost of the t-shirts and subtracting that from her total expenditure.
Step-by-step explanation:
The student has asked how much she paid for each pair of socks when Marcia went to the store and purchased 6 pairs of socks and 3 t-shirts, having spent a total of $39. She paid $8.50 per t-shirt.
To find the cost of each pair of socks, first calculate the total cost of the t-shirts: 3 t-shirts × $8.50 = $25.50. Subtract this amount from the total spent to find the cost of the socks: $39 - $25.50 = $13.50. Now, divide this by the number of sock pairs: $13.50 ÷ 6 pairs of socks = $2.25 per pair of socks.