Final answer:
To express 56 * 10^6 with a metric prefix, we use 'M' for mega, which represents 10^6. Therefore, the resulting expression as 56 M is indeed correct.
Step-by-step explanation:
The expression 56 * 10^6 can indeed be expressed with a metric prefix. In the metric system, different factors of 10 are denoted by specific prefixes. The prefix 'M' stands for mega, which is equivalent to 10^6. Therefore, 56 * 10^6 is correctly written as 56 M, with 'M' indicating millions. For example, if we were talking about bytes of computer memory, 56 megabytes (56 MB) would signify 56 million bytes. Similarly, if we were expressing a length, 56 meters with the 'M' prefix would be 56 megameters, or 56 million meters.