index match array

Hi, I'm hoping someone here can help me. I am trying to return the cells that have a value in column A if R1 matches with the corresponding table header. I think an array index match formula is the way to go but I can't seem to get my head around it.

I cannot find an answer to this anywhere, so hoping you can help! I have a list of ref IDs in Column A which may or may not be unique (eg. 1, 1, 1, 2, 3, 3, 4, 4 ,4 ,4...etc). I need to be able to find the last instance of EACH of these ref IDs in Column A and sum the associated cell values in a...

I'm using Google Sheets. In another tab, I'm trying to match in the values (in the white part of the table) based on the three criteria. So for example, I'm wanting to match in the 0.2856... for criteria: Member #1, 1, A.

I'm trying to match in a value (either using SUMIFS or INDEX MATCH) based on multiple criteria (two rows, one column).

Hey, First time posting. I have a data set with duplicate account keys and values in the form of email addresses. I need to create a consolidated data set that has only one account key and a corresponding email value. My issue is this -- some of the duplicate account keys have blanks or "old...