The mathematical expression 150 - 137 = - 13 pounds is the most appropriate because it includes all the data necessary to express the weight loss over 5 weeks.
To know the weight lost it is necessary to do the following mathematical operations:
1. Subtract the starting weight from the ending weight.
- 150 - 137 = -13
The -13 means the weight lost during the first 5 weeks of going to the gym.
Note: Neither option is correct. The correct answer would be 150 - 137 = - 13 pounds; A cweight change is negative because it decreases weight.
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