Coukd you please help me understand the mistakes I have made?

Wheelys, Inc, designs and sells footwear with a wheel in the heel, worn by sometimes-annoying kids at shopping malls. Assume it recently disclosed the following information concerning the Alinwano. f............ its and report Required: 1-a. Complete the T-account for the Allowance for Doubtful Accounts by entering into it the 2020 amounts from the abcve schedult (Enter your answers in thousands.) 1-b. Complete the T-account in equation format given below to prove that the above items account for the changes in the account (Enter your answers in thousands.) 3. Record summary journal entries for 2019 related to (a) estimating Bad Debt Expense and (b) writing off specific belances. (Ot no entry is required for a transaction/event, select "No journal entry required" in the first account field. Enter your answers in thousands.) 4. Supply the missing dollar amount for 2018. (Enter your answer in thousands.)