8 flares are most likely to occur in one century. However, the answer is 8.33, so take that into account.
An=A1+(n-1)d
-20=A1+(15-1)x-7
-20=A1+14 x -7
-20=A1-98
+98 +98
-98+98=0
-20+98=78
A1=78
Step-by-step explanation:
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A is correct
B is correct
C is wrong
D is wrong
Simple...
6x-5=19
x= 19+5
= 24
x= 24/6
= 4
Thus, your answer is 4.
Hope This Helps!