The variable t represents the temperature at 6 p.m.

Which equation would best model the word problem below?

The temperature at the summit of Mt. Washington dropped 19°F between 6 p.m. and 10 p.m. The temperature at 10 p.m. was –12°F. What was the temperature at 6 p.m.?

A.
12 – 19 = t

B.
19 + 12 = t

C.
t – 19 = –12

D.
19 – t = –12