please explain

In 2023 , Elaine paid $2,800 of tuition and $600 for books for her dependent son to attend State University this past fall as a freshman. Elaine files a joint return with her husband. What is the maximum American opportunity tax credit that Elaine can claim for the tuition payment and books in each of the following alternative situations? Note: Leave no answer blank. Enter zero if applicable. a. Elaine's AGI is $80,000. In 2023. Elaine paid $2,800 of tuition and $600 for books for her dependent son to attend State University this past fall as a freshman. Elaine files a joint return with her husband. What is the maximum American opportunity tax credit that Elaine can claim for the tuition payment and books in each of the following alternative situations? Note: Leave no answer blank. Enter zero if applicable. b. Elaine's AGI is $168,000. In 2023 , Elaine paid $2,800 of tuition and $600 for books for her dependent son to attend State University this past fall as a freshman. Elaine files a joint return with her husband. What is the maximum American opportunity tax credit that Elaine can claim for the tuition payment and books in each of the following alternative situations? Note: Leave no answer blank. Enter zero if applicable. c. Elaine's AGI is $184,000. Trey has two dependents, his daughters, ages 14 and 18, at year-end. Trey files a joint return with his spouse. What amount of child tax credit (either as a child or a qualifying dependent) will Trey be able to claim in 2023 for his daughters under each of the following alternative situations? Use Exhibit 8-8. c. His AGI is $420,100, and his daughters are ages 10 and 12