Final answer:
The community center spent a total of $29.68 on poster boards.
Step-by-step explanation:
To find the total amount spent on poster boards, we need to multiply the cost per board by the number of boards. In this case, the cost per board is $4.24 and the number of boards is 7.
To calculate the total cost, we multiply $4.24 by 7:
Total cost = $4.24 x 7 = $29.68
Therefore, the community center spent a total of $29.68 on poster boards.