What is the computer's main memory, which consists of the random access memory (ram), cache memory, and read-only memory (rom) that is directly accessible to the cpu?

Hey there!

The main memory of a computer that includes RAM, ROM, and cached information that is accessible through the CPU is called primary storage. These memory/storage types deal directly with how the computer functions and runs. The other type of storage is called secondary storage and refers to storage that isn't directly connected to the CPU, such as the hard drive. 

Hope this helped you out! :-)

According to my brain it's a rational number because it can be put as a fraction