Final answer:
The inequality showing the total cost C that Kurt could pay for his textbooks is C ≤ 407.75.
Step-by-step explanation:
To express the total cost C that Kurt could pay for his textbooks, we need to consider the required textbooks and the optional textbooks. We can represent the cost of the required textbooks as C_r and the cost of the optional textbooks as C_o. The inequality showing the total cost C that Kurt could pay for his textbooks is:
C_r + C_o ≤ 342.50 + 65.25
Therefore, the inequality is C ≤ 407.75.