Answer:
Step-by-step explanation:
a=1,t1=1,t2=8,t3=15
t2-t1=8-1
=7
t3-t2=15-8
Therfore d=7.
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Answer:
Step-by-step explanation:
a=1,t1=1,t2=8,t3=15
t2-t1=8-1
=7
t3-t2=15-8
=7
Therfore d=7.