Final answer:
Larry's average cost per gallon of gasoline for the month is $3.39, calculated by adding up all the purchase prices and dividing by the number of prices.
Step-by-step explanation:
To calculate the average price per gallon Larry paid for gasoline, we simply need to add up all the prices he paid and then divide by the number of prices. Larry's purchases were at $3.29, $3.35, $3.49, $3.39, and $3.42 per gallon. The total cost of these prices is:
$3.29 + $3.35 + $3.49 + $3.39 + $3.42 = $16.94
Since Larry made five purchases, we divide the total cost by five to find the average.
$16.94 รท 5 = $3.39
Therefore, the average cost per gallon of gasoline that Larry paid during the month is $3.39.