Answer and Explanation:
Since in the question it is mentioned that the J.brown provides a service and on the instant it collected the cash for $1,900
So here the journal entry that would be
Cash Dr $1,900
To Service revenue $1,900
(Being cash collected is recorded)
The service revenue is shown in the on the right side of the T-account that should be credited and the cash to be shown on the left hand side of the T-account that should be debited as both the account is increasing.