urlacainnxp

2022-01-24

Finish the sequence
$7,3,–1,-5,-9,–13,?,?$
$1,1,2,3,5,8,13,?,?$
$32,30,26,20,12,?,?$

caoireoilns

Expert

We have to fill the blacks
1) $7,3,–1,-5,-9,–13,?,?$
$7-4=3$
$3-4=-1$
$-1-4=-5$
$-5-4=-9$
$-9-4=-13$
$-13-4=-17$
$-17-4=-21$
Thus, we have the sequence $7,3,-1,-5,-9,-13,-17,-21$
2)$1,1,2,3,5,8,13,?,?$
$1+1=2$
$1+2=3$
$2+3=5$
$3+5=8$
$5+8=13$
$8+13=21$
$13+21=34$
Hence, we have the sequence $1,1,2,3,5,8,13,21,34$
3)$32,30,26,20,12,?,?$
$32-2=30$
$30-4=26$
$26-6=20$
$20-8=12$
$12-10=2$
$2-12=-10$
$-10-14=-24$
Thus, we have the sequence $32,30,26,20,12,2,-10,-24$

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