Final answer:
After spending $37 on pizza and $89 on concert tickets, John overdrawn his account by $26. This calculation subtracts the total expenses from his initial amount, resulting in a negative balance.
Step-by-step explanation:
John initially has $100, and we need to calculate how much money he will have on Monday after his expenses over the weekend. He bought pizza for $37 and concert tickets for $89, totaling $126 in expenses. To find out how much money John has left, we subtract his total expenses from his initial amount:
Initial Amount: $100
Total Expenses (Pizza + Concert Tickets): $37 + $89 = $126
Now, subtract the total expenses from the initial amount:
$100 - $126 = -$26
This means John will have a deficit of $26. Since he spent more than what he initially had, it implies he has overdrawn his account by $26.