Answer:
Wendy leaves school to go home. She walks 60 yards north and then 80 yards west. She is 10 yards from the school.
Step-by-step explanation:
The answer is simply B. 48
For this case we must find the value of the following expression:

The law of the signs of multiplication states that:

We add similar terms, taking into account that equal signs are added and the same sign is placed, while different signs are subtracted and the sign of the major is placed.

Answer:
-137.8