Dirk is the maker of a note, on which erv is secondarily liable. friendly credit company is the current holder of the note. erv will be obligated to pay the note if

Erv will be obligated to pay the note if  Dirk defaults on the note.

Explanation:

Erv is the guarantor of Dirk's note. If for any reason Dirk cannot pay the note, then Erv will be responsible for paying the note. Under normal circumstances, Dirk should be responsible for paying the note, but if he just doesn't wish to pay it anymore, Erv will have to pay it, but he will also be able to demand for repayment from Dirk.  

answer; operating revenues;

the first successful, urban blues recording, selling more than 75,000 copies, was made in year 1920.

mamie smith recorded the first commercially successful example of the urban blues,   with the recording of “crazy blues”."crazy blues" was recorded on august 10, 1920, in new york city. within a month of the release of “crazy blues” it had sold 75,000 copies.