If the temperature in frostburg is 18 less than the temperature in coldspot, then the following equation compares the two temperatures:
[tex] f = c-18 [/tex]
where [tex] f,c [/tex] are the temperatures in frostburg and coldspot. Since we're given [tex] f [/tex], we can solve for [tex] c [/tex]:
[tex] -7 = c-18 \iff c = -7+18 = 11 [/tex]
