May i know Q1 to Q4 Thanks

Extended DuPont Identity: Tasks Refer to the Financial Statements for Alphabet Inc. 1) Which base ratio {b1,b2,b3,b4} explains the most of the ln in ROE? Why? 2) ROA vs EM: Which explains the least of the ln in ROE? Why? 3) Which base ratio weakened? Why? 4) What were the external funding needs from 2020 to 2021 ? Extended DuPont Identity: Tasks Refer to the Financial Statements for Alphabet Inc. 1) Which base ratio {b1,b2,b3,b4} explains the most of the ln in ROE? Why? 2) ROA vs EM: Which explains the least of the ln in ROE? Why? 3) Which base ratio weakened? Why? 4) What were the external funding needs from 2020 to 2021