Answer
There were 6 characters killed in Scream, 8 in Scream 2, and 9 in Scream 3.
Work Step by Step
Scream=x
Scream 2=x+2
Scream 3=x+3
Scream 4=10
x+x+2+x+3+10=33
3x+15=33
3x=18
x=6
scream 2=6+2=8
scream 3=6+3=9
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