The tables below show four sets of data:
set a
x 1 2 3 4 5 6 7 8 9
y 10 9 8 7 6 5 4 3 2
set b
x 1 2 3 4 5 6 7 8 9
y 3 4 5 6 7 8 9 10 11
set c
x 1 2 3 4 5 6 7 8 9
y 8 6 5 4 3.5 3 2.5 2 2
set d
x 1 2 3 4 5 6 7 8 9
y 1 2.5 2.5 3 4 5 6 8 9
for which set of data will the scatter plot represent a negative linear association between x and y? (4 points)
set a
set b
set c
set d

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.