Answer :
To determine how many hours he dove, we need to find an expression that makes sense in a context where you are converting one unit to another or calculating a rate based on given values.
Out of the given expressions:
- [tex]$-2.54 + 18$[/tex]
- [tex]$18 + 2.54$[/tex]
- [tex]$-18 \div -2.54$[/tex]
- [tex]$2.54 \times 18$[/tex]
### Steps to find the correct expression:
1. Examine Addition and Subtraction Expressions:
- [tex]$-2.54 + 18$[/tex]: Adding a negative number will decrease the total value, leading to 15.46, which wouldn't be a logical answer for a time duration.
- [tex]$18 + 2.54$[/tex]: Adding these numbers gives 20.54, which also doesn't seem reasonable for estimating time.
2. Product Expression:
- [tex]$2.54 \times 18$[/tex]: Multiplying these values would give a much larger number, which would be in terms of square hours or square units (physically meaningless in our context).
3. Division Expression:
- [tex]$-18 \div -2.54$[/tex]: Dividing a negative number by another negative number results in a positive number. Specifically, the division of [tex]$-18$[/tex] by [tex]$-2.54$[/tex] results in approximately 7.0866. This is a reasonable number of hours, as it falls within an expected range for diving hours.
Therefore, the correct expression that you can use to find how many hours he dove is:
[tex]\[ -18 \div -2.54 \][/tex]
Out of the given expressions:
- [tex]$-2.54 + 18$[/tex]
- [tex]$18 + 2.54$[/tex]
- [tex]$-18 \div -2.54$[/tex]
- [tex]$2.54 \times 18$[/tex]
### Steps to find the correct expression:
1. Examine Addition and Subtraction Expressions:
- [tex]$-2.54 + 18$[/tex]: Adding a negative number will decrease the total value, leading to 15.46, which wouldn't be a logical answer for a time duration.
- [tex]$18 + 2.54$[/tex]: Adding these numbers gives 20.54, which also doesn't seem reasonable for estimating time.
2. Product Expression:
- [tex]$2.54 \times 18$[/tex]: Multiplying these values would give a much larger number, which would be in terms of square hours or square units (physically meaningless in our context).
3. Division Expression:
- [tex]$-18 \div -2.54$[/tex]: Dividing a negative number by another negative number results in a positive number. Specifically, the division of [tex]$-18$[/tex] by [tex]$-2.54$[/tex] results in approximately 7.0866. This is a reasonable number of hours, as it falls within an expected range for diving hours.
Therefore, the correct expression that you can use to find how many hours he dove is:
[tex]\[ -18 \div -2.54 \][/tex]
