Jamaal has to make an important phone call. unfortunately, his cell phone is not charged and he has to use his landline, which does not store phone numbers. to make the call, he has to get the number from his cell phone and remember it long enough to dial on his landline. for this task, which memory system is most important?

In case of Jamaal's task, the memory system which is most important is WORKING MEMORY SYSTEM or SHORT-TERM MEMORY SYSTEM.

In case of humans, there are 3 typed of memories:
1. Sensory memory
2. Short-term memory (Working memory)
3. Long-term memory (Life time memory)
Since in the above question, Jamaal needs to memorize the phone numbers for a short period of time, it is an example of short-term memory.