Answer:
Assets                                                 = Liabilities         + Stockholders' equity
Accounts receivable $31,000(+)                                    Revenue  $31,000(+)
Cash                            $23000 (+)
Accounts receivable $23,000(-)
Bike  equipment        $16,000(+)     notes payable $16,000(+)
Cash                           $3,100(-)                               retained earnings$3,100(-)
Explanation:
The first transaction increases assets (accounts receivable) by $31000 while revenue (stockholders' equity) increased by the same amount
The cash receipt of $23,000 increases asset cash by $23,000 and decreases an asset, accounts receivable by the same amount.
The purchase of an asset by notes payable increases asset, bike equipment by $16,000, while liabilities(notes payable) also increases by $16,000
The payment of utilities for $3,100 decreases asset (cash) by $3,100 while stockholders equity (retained earnings) decreases by same amount.