Financial Accounting exercise question - journal entries?

exercise give trial balance of july 31, & transactions occurred in august, have post in journal form.
problem following cannot identify have debit , credit:
a) completed series of designs began on july 31 , billed total design services performed, including accrued revenues of $800 had been recognized in adjusting entry in july, $1,400

adjusting entries:
b)services performed payment had been received in advance totaled $1,300
c) services performed not billed until september totaled $580

thank you

the exercise give trial balance of july 31, & transactions occurred in august, have post in journal form. problem following cannot identify have debit , credit: a) completed series of designs began on july 31 , billed total design...

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