Arithmetic Sequence: 3,12,21 _,_,_,_

Arithmetic sequence: 3,12,21 _,_,_,_

 

Answer:

3,12,21,30,39,48,57

Step-by-step explanation:

3,12,21 _,_,_,_

d=9

an=a1+(n−1)d

an=3+(9)(n−1)

an=3+(9n−9)

an=9n−6

Find a4

an=9n−6

a4=9(4)−6

a4=36−6

a4=30

a5=(9)(5)−6

a5=45−6

a5=39

a6=(9)(6)−6

a6=54−6

a6=48

a7=(9)(7)−6

a7=63−6

a7=57

3,12,21,30,39,48,57

#JuneChallenge


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