Table:
0
A
B
C
D
E
F
1
District
Incumbent
Party
First elected
Result
Candidates
2
California 1
Clarence F. Lea
Democratic
1916
Re-elected
Clarence F. Lea (D) Unopposed
3
California 2
Harry Lane Englebright
Republican
1926
Re-elected
Harry Lane Englebright (R) Unopposed
4
California 4
Florence Prag Kahn
Republican
1925
Re-elected
Florence Prag Kahn (R) Unopposed
5
California 5
Richard J. Welch
Republican
1926
Re-elected
Richard J. Welch (R) Unopposed
6
California 6
Albert E. Carter
Republican
1924
Re-elected
Albert E. Carter (R) Unopposed
7
California 7
Henry E. Barbour
Republican
1918
Re-elected
Henry E. Barbour (R) Unopposed
8
California 8
Arthur M. Free
Republican
1920
Re-elected
Arthur M. Free (R) Unopposed
9
California 9
William E. Evans
Republican
1926
Re-elected
William E. Evans (R) Unopposed
10
California 10
Joe Crail
Republican
1926
Re-elected
Joe Crail (R) 75.0% John F. Dockweiler (D) 25.0%

Questions and formulas:
Question: what's the district with incumbent being richard j. welch
Formula: FILTER(A1,B1="Richard J. Welch")
Formula2: FILTER(A2:A10,B2:B10="Richard J. Welch")
Level: easy
Question: what's the districtwith party being democratic
Formula: FILTER(A1,C1="Democratic")
Formula2: FILTER(A2:A10,C2:C10="Democratic")
Level: easy
Question: what's the district with candidates being harry lane englebright (r) unopposed
Formula: FILTER(A1,F1="Harry Lane Englebright (R) Unopposed")
Formula2: FILTER(A2:A10,F2:F10="Harry Lane Englebright (R) Unopposed")
Level: easy
Question:  how many candidates with district being california 7
Formula: ROWS(FILTER(F1,A1="California 7"))
Formula2: ROWS(FILTER(F2:F10,A2:A10="California 7"))
Level: easy
Question: what's the party with incumbent being william e. evans
Formula: FILTER(C1,B1="William E. Evans")
Formula2: FILTER(C2:C10,B2:B10="William E. Evans")
Level: easy