Final answer:
The total volume of both witch's hats is 292.484 cubic inches.
Step-by-step explanation:
To find the volume of each witch's hat, we can use the formula for the volume of a cone: V = (1/3)πr²h. In this case, the radius (r) is 3.4 inches and the height (h) is 12.5 inches.
So, for each hat, the volume can be calculated as follows: V = (1/3)π(3.4 in)²(12.5 in) = 146.242 in³.
To find the total volume of both hats, we just need to add the volumes together: Total volume = 2 * 146.242 in³ = 292.484 in³.