Table:
0
A
B
C
D
E
F
1
District
Incumbent
Party
First elected
Results
Candidates
2
Wisconsin 1
Paul Ryan
Republican
1998
Re-elected
Paul Ryan (R) 62.8% Jeff Thomas (D) 37.2%
3
Wisconsin 2
Tammy Baldwin
Democratic
1998
Re-elected
Tammy Baldwin (D) 62.9% Dave Magnum (R) 37.1%
4
Wisconsin 3
Ron Kind
Democratic
1996
Re-elected
Ron Kind (D) 64.9% Paul Nelson (R) 35.1%
5
Wisconsin 4
Gwen Moore
Democratic
2004
Re-elected
Gwen Moore (D) 71.5% Perfecto Rivera (R) 28.5%
6
Wisconsin 6
Tom Petri
Republican
1979
Re-elected
Tom Petri (R) unopposed

Questions and formulas:
Question: What district first elected a Democratic incumbent in 1998?
Formula: FILTER(A1,(C1="Democratic")*(D1=1998))
Formula2: FILTER(A2:A6,(C2:C6="Democratic")*(D2:D6=1998))
Level: easy