To estimate the cost of 14.2 gallons of gasoline at $3.65 per gallon, we can multiply the price per gallon by the number of gallons:
\[ \text{Cost} = \text{Price per gallon} \times \text{Number of gallons} \] \[ \text{Cost} = 3.65 \times 14.2 \]
To estimate quickly, you can round $3.65 to $3.70 and then multiply:
\[ 3.70 \times 14.2 \approx 3.7 \times 14 = 51.8 \]
Since $3.65 is closer to $3.70, the total cost will be just slightly less than $51.8.
Now, let's calculate the exact cost for accuracy:
\[ 3.65 \times 14.2 = 51.83 \]
When looking at the options provided:
- $18
- $30
- $40
- $56
The approximate cost ($51.83) is closest to $56.
Thus, the estimated cost of 14.2 gallons of gasoline is $56.