You should ask your parent/guardian
or teacher if needed! Merry Christmas!
Answer:
b because -4°F plus 4°F would be 0°F
look at the screenshot :)
You can do part a using The Pythagoras theorem:-
30^2 = x^2 + 24^2
x^2 = 30^2 - 14^2 = (30+24)(30-24) = 324
x = 18