The memory that is left on his phone is 44gb.
Given that,
64 GB of capacity were included with Jonah's smartphone. He used 15GB total. He then recorded photos and videos from a vacation using 5 GB of memory.
Total Memory in his phone = 64gb
Jonah's used 15gb which means = 64 - 15 = 49gb
He then recorded photos and videos from a vacation using 5 GB of memory = 49 - 5 = 44Gb
The addition expression is 64-15-5 = 44gb.
Take -15 and -5 add them together get -20 then take 64 and subtract 20 leaving you with 44 GB left on his phone.
Therefore, the memory that is left on his phone is 44gb.
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