Zack Mason invested $47,000 in cash to start the firm. 4 Purchased office equipment for $5,200 on credit from Den, Inc.; received Invoice 9823, payable in 30 days. 16 Purchased an automobile that will be used to visit clients; issued Check 1001 for $13,200 in full payment. 20 Purchased supplies for $390; paid immediately with Check 1002. 23 Returned damaged supplies for a cash refund of $105. 30 Issued Check 1003 for $3,050 to Den, Inc., as payment on account for Invoice 9823. 30 Withdrew $1,700 in cash for personal expenses. 30 Issued Check 1004 for $1,050 to pay the rent for September. 30 Performed services for $2,900 in cash. 30 Paid $370 for monthly telephone bill, Check 1005.

Sept. 1

Dr. Cash               $47,000

Cr.  Zack Capital   $47,000

Sep. 4

Dr. Office Equipment   $5,200

Cr.  Den, Inc                  $5,200

Sep. 16

Dr. Automobil (Car)   $13,200

Cr.   Bank                    $13,200

Sep. 20

Dr. Supplies   $390

Cr.   Bank        $390

Sep. 23

Dr. Cash                       $105

Cr.   Purchases Return $105

Sep. 30

Dr. Den, Inc.   $2,900

Cr.   Bank        $2,900

Dr. Zack Drawing   $1,700

Cr.   Cash                $1,700

Dr. Rent Expense   $1,050

Cr.   Bank                 $1,050

Dr. Cash                    $2,900

Cr.  Service revenue $2,900

Dr. Telephone Expense  $370

Cr. Cash                           $370

Explanation:

Sept. 1

As cash is received, so cash account is debited and capital account is credited due to the credit nature of capital account

Sep. 4 Purchased office equipment is the addition of asset so, this is debited and payable is credited because payment has not been made yet.

Sep. 16 Automobile is purchase which is also an asset so, it is debited and bank is credited because payment is made through check.

Sep. 20 Purchased supplies for $390 is also an addition in assets for the company so, it is debited bank is credited because payment is made through check.

Sep. 23 As cash is received, so it debited. Purchases Return account is credited because it is an contra purchases account and normally it has credit balance.

Sep. 30 Payment of payable made through check, Payable is debited and bank is credited.

Cash Withdrawn for personal used, drawing account is an contra capital account so, it is debited and cash is paid, it is credited.

Rent is paid through check, As rent is an expense, it is debited due to its debit nature.

Services are performed against cash, so, service revenue is credited and cash receipt is debited in cash account.

Telephone bill is paid through check, As telephone expense account debited due to its debit nature.

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value