Final answer:
The volume of the object with the given dimensions is 147 cubic centimeters (147cm³).
Step-by-step explanation:
The volume of an object can be determined by multiplying its height, width, and length. For a rectangular box shape, which this object seems to be, the formula for volume (V) is: V = height × width × length.
Given the dimensions of the object are a height of 2.5cm, a width of 2.8cm, and a length of 21cm, we can calculate its volume as follows:
V = 2.5cm × 2.8cm × 21cm = 147cm³
Therefore, the volume of the object is 147 cubic centimeters (147cm³).