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

−85
negative 8 over 5

−8−8−8−8−8
negative 8 minus 8 minus 8 minus 8 minus 8

−8+(−8)+(−8)+(−8)+(−8)
negative 8 plus negative 8 plus negative 8 plus negative 8 plus negative 8

−8(5)

Answer 1

To determine which expression cannot be used to find the diver's depth after 5 minutes, we should first calculate her depth after 5 minutes at a rate of 8 meters per minute.

The diver descends at a rate of 8 m/min for 5 minutes. Therefore, her depth will be:

Depth = Rate × Time
Depth = -8 m/min × 5 min = -40 m

Now, let's examine each expression:

1. **−85**: This is a single value and does not represent the calculation for depth after 5 minutes. **This expression cannot be used to find her depth.**

2. **−8−8−8−8−8**: This represents the depth calculation as -8 added together 5 times, which is a way to express -8 times 5, resulting in -40.

3. **−8+(−8)+(−8)+(−8)+(−8)**: This is equivalent to adding -8 five times, which also results in -40, same as the previous one.

4. **−8(5)**: This directly represents the calculation of -8 times 5, which equals -40.

Based on this analysis, the expression that **CANNOT** be used to find her depth after 5 minutes is:

**−85**