Which situation results in a solution of zero?
a
the record low temperature in a city is −12
−
12
degrees. today, the temperature is 12
12
degrees. what is the difference between the record low and today’s temperature?
b
shawn earned $42
$
42
from babysitting last friday night. on saturday, shawn earned another $42
$
42
from babysitting. how much money did shawn earn from babysitting?
c
a building has 5 floors above ground and 5
5
floors below ground. an elevator descended 5
5
floors below ground. the elevator then rose 5
5
floors. how far was the elevator from the top floor?
d
nicole walked 10
10
blocks north from her house to a friend’s house. after visiting, nicole walked 10
10
blocks south back to her house. how far was nicole from her starting place?
i really don't know how to awnser