Final answer:
Donald spent $38.86 on gas by multiplying the number of gallons (14.5) by the cost per gallon ($2.68).
Step-by-step explanation:
The question asks how much Donald spent on gas when he put 14.5 gallons in his car, given that a gallon of gas cost $2.68 last week.
To find the total cost, we multiply the number of gallons by the cost per gallon. So, the calculation is:
14.5 gallons × $2.68 per gallon = Total Cost
Carrying out the multiplication gives us:
14.5 × 2.68 = $38.86
Therefore, Donald spent $38.86 on gas.