Question
6. A diver descends at a rate of 8 m/min. Which expression CANNOT be used to find her depth after 5 minutes?(1 point)
Responses
−8(5)
negative 8 times 5
−8+(−8)+(−8)+(−8)+(−8)
negative 8 plus negative 8 plus negative 8 plus negative 8 plus negative 8
−85
negative 8 over 5
−8−8−8−8−8
Responses
−8(5)
negative 8 times 5
−8+(−8)+(−8)+(−8)+(−8)
negative 8 plus negative 8 plus negative 8 plus negative 8 plus negative 8
−85
negative 8 over 5
−8−8−8−8−8
Answers
GPT-4o mini
To determine which expression cannot be used to find the diver's depth after 5 minutes, we need to identify the expressions that accurately represent the diver's descent at a rate of 8 meters per minute for 5 minutes.
The depth after 5 minutes of descending at 8 m/min would be calculated as:
1. **−8(5)**: This represents the product of the rate and time, which equals −40 meters. This expression is valid.
2. **−8 + (−8) + (−8) + (−8) + (−8)**: This is the sum of 5 instances of -8, which also equals −40 meters. This expression is valid.
3. **−85**: This does not correspond to the descent calculation. It does not relate to the rate of descent and is not factored by the time. This expression is invalid.
4. **−8−8−8−8−8**: This is the same as adding five instances of -8, which equals −40 meters. This expression is valid.
Based on the analysis, the expression that **CANNOT** be used to find her depth after 5 minutes is:
**−85**
The depth after 5 minutes of descending at 8 m/min would be calculated as:
1. **−8(5)**: This represents the product of the rate and time, which equals −40 meters. This expression is valid.
2. **−8 + (−8) + (−8) + (−8) + (−8)**: This is the sum of 5 instances of -8, which also equals −40 meters. This expression is valid.
3. **−85**: This does not correspond to the descent calculation. It does not relate to the rate of descent and is not factored by the time. This expression is invalid.
4. **−8−8−8−8−8**: This is the same as adding five instances of -8, which equals −40 meters. This expression is valid.
Based on the analysis, the expression that **CANNOT** be used to find her depth after 5 minutes is:
**−85**