Answer:
Common difference (d) = -5
Step-by-step explanation:
formula=>
an = a + (n-1)d
=> -8 = 7 + (4-1)d
=> -15 = 3d
=> 3d = -15
=> d = -15/3
=> d = -5

and surely you'd know what the roots are
Answer:
Step-by-step explanation:
- add hen sub ten bom anwwer
Negative, because Correlation and slope have the same direction (Sxy will be negative)