Final answer:
The weekly cost for radio advertising, running 5 spots per day at $40 per spot, would be $1,400.
Step-by-step explanation:
To calculate the weekly cost for radio advertising, multiply the cost per spot by the number of spots per day and then multiply that result by 7 (the number of days in a week). In this case, the cost per spot is $40 and the number of spots per day is 5. So, the calculation would be: $40 * 5 * 7 = $1400.