Final answer:
The closest length of one side of Jhospe's office in feet is 12 ft.
Step-by-step explanation:
To find the length of one side of Jhospe's office, we need to calculate the square root of the area he used to cover the floor. Jhospe used 148 ft² of measurement, so to find the length of one side, we take the square root of 148 ft². Taking the square root of 148 gives us approximately 12.165 ft. Since we are asked for the closest length, the closest option would be 12 ft (option a).