Answer:
The change in how much money that Angelo had is $300.
Explanation:
Since Angelo deposited a $800 check, which implies that he would have $800 at maturity of the check.
He spent $500 on a clarinet from the $800.
So that,
The change in how much money Angelo had = amount deposited - amount spent on the clarinet
= $800 - $500
= $300
Therefore, the change in how much money that Angelo had is $300.