Final answer:
To calculate the perimeter of the base of the tanning bed, assuming it is square-shaped, the formula is 4 times the side length, 4a. The perimeter is expressed in the same units as the side length.
Step-by-step explanation:
To write an expression that represents the perimeter of the base of the tanning bed, we need to assume a shape for the base. A common approach is to approximate the shape to a simpler one, like turning a circular base into a square. If we assume the side length of this square is 'a', then the perimeter of the square base would be 4a.
The perimeter of the base of the tanning bed, if square-shaped, with side length 'a' is simply calculated as:
Perimeter = 4 × Side Length = 4a
Remember, the dimensions are consistent with the unit of measurement, meaning if 'a' is in meters, the perimeter will be in meters as well.