Final answer:
Eli's gas mileage is calculated by dividing the miles driven (856 miles) by the gallons of gas used (29.4 gallons), which equals approximately 29.115646 mpg. When rounded to the nearest whole number, the mileage is 29 mpg, making the answer A. 29 mpg.
Step-by-step explanation:
To calculate Eli's gas mileage, divide the number of miles he drove by the gallons of gas used. The formula is:
Gas mileage = Total miles driven / Total gallons used
By applying this formula, we find:
Gas mileage = 856 miles / 29.4 gallons = 29.115646 mpg
When rounding to the nearest mile per gallon (mpg), Eli's gas mileage is:
Gas mileage = 29 mpg (rounded)
Therefore, the correct answer to the question is A. 29 mpg.