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Felix has $100 in the bank and writes a check for $150. He now has
dollars.
Alina leaves her house with $40 in her wallet. She comes home with $40 in her wallet. This indicates a
change.
Lucas has no money. He does some chores and earns $5. He has

Answer :

If Felix were to have $100 and writes a check for $150 wouldn't that mean that he has insufficient funds? He has $100 if he writes a check to someone he would not have any money left. He would have -$50.

Alina has $40 when she leaves and she comes back with $40, the question states that there is a change but there is none. She left and came back with the same exact amount of money. Nothing changed.

If Lucas has no money, does some chores, and earns $5, then he would have $5. You didn't complete the question so I will not answer any further.