1. (3 points) Let p, q, r, s denote the following p: I complete my math homework before evening. q: I will go for a walk at night. r: The moon is visible. s: The temperature is mild. Write the following in symbolic form: (a) If the moon is visible, I will go for a walk tonight. (b) Completing my math homework before evening is necessary for me to go for a walk at night. (c) A mild temperature and a visible moon are sufficient for me to go for a walk tonight.

Fig: 1