To determine how much Terry spent on socks, let's break down the information step by step:

1. Terry buys 2 packages of socks, and each package costs $9.
2. Therefore, for each visit to the store, Terry spends $2 \times 9 = 18$ dollars on socks.
3. Terry has gone to the store 7 times in the last 6 months.
4. So, to find the total amount spent on socks, multiply the cost per visit by the number of visits: $18 \times 7 = 126$ Thus, Terry has spent a total of $126 on socks.

The expression that represents how much Terry spent is: $2 \times 9 \times 7$

Would you like further details or explanations?

Here are 5 related questions for practice:

1. How much would Terry spend if he bought 3 packages of socks per visit instead of 2?
2. If the price of each sock package increases to $10, how much would Terry spend in 7 visits?
3. How much would Terry spend in 10 visits at the current price and number of packages?
4. If Terry went to the store 5 times, how much would he spend on socks?
5. If Terry also buys a $15 hat every visit, how much does he spend on both socks and the hat after 7 visits?

Tip: When dealing with repetitive purchases, always consider the number of visits and cost per visit to calculate the total.