Cumulative Problem 2 (Chapters 1-2) Essentials of Federal Income Taxation for Individuals and Business (2019)

I am trying really hard to understand how this is supposed to be set up but with everything changing it is getting confusing. Please help, I want to make sure I did it correctly. Thanks!

CUMULATIVE PROBLEM 2 (CHAPTERS 1-2) Emily and David Chen claim their three children, ages 5-10, as dependents. During 2019, Emily worked full-time and earned $39,850. Her employer withheld nothing for federal income taxes. David attended college full-time for the entire year. Other than Emily's wages, the couple's only other source of earned income is $800 of taxable interest. (David received a tax-free scholarship that paid for his college tuition, book, and fees.) The Chens paid $2,500 in qualified childcare expenses so that Emily could work and David could attend college. Compute the couple's taxable income and taxes owed (to be refunded) on their 2019 joint tax return. The couple uses the standard deduction. They are both under age 65 and have no problems with their vision