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The temperature is 15℃ and drops 8℃. Write an addition equation to calculate the final temperature. What is the final temperature?

a.) 5 + 8 = 9; 9℃
b.) 8 + 15 = 23; 23℃
c.) 8 + (-15) = -7; -7℃
d.) 15 + (-8) = 7; 7℃