Which expression is equivalent to (−18) – 64 ?

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Which of these terms are associated with communication between neurons? chemical signals, electrical signals, synapse chemical signals, synapse, neurotransmitters synapse, electrical signals, chemical signals synapse, electrical signals, neurotransmitters

How many liters of 60% alcohol solution should be added to 40 liters of a 20% alcohol solution to make a 50% solution?