Indicate which of the following are exact numbers. the mass of a stapler? i think its inexact because all staplers are different sizes. Is that correct? Also,the mass of a postage stamp. is that inexact? because they can also be diff. sizes?

You are correct in your understanding. The term "exact number" refers to a value that is known with complete certainty and is not subject to any variation or measurement error. In the case of the mass of a stapler and a postage stamp, both can be considered inexact numbers due to the potential variation in size and weight.

The mass of a stapler can vary depending on factors such as the material used, the design, and the size. Therefore, it cannot be considered an exact number. Similarly, the mass of a postage stamp can also vary depending on its size and design, making it an inexact number as well.

To determine the exact mass of a specific stapler or postage stamp, you would need to measure it using a scale or consult the product specifications provided by the manufacturer or postal authority.