Final answer:
The combined height of the two boxes and the microwave is 145 inches.
Step-by-step explanation:
To find the combined height of the two boxes and the microwave, we need to convert all measurements to the same units. Let's convert everything to inches. The first box is 4 feet 4 inches tall, which is equal to 52 inches. The second box is 3 feet 11 inches tall, which is equal to 47 inches. The microwave is 3 feet 10 inches tall, which is equal to 46 inches. To find the combined height, we simply add the heights of all three objects: 52 + 47 + 46 = 145 inches.