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please help! also please explain how to solve

Please Help Also Please Explain How To Solve class=

Sagot :

Answer:

B

Step-by-step explanation:

a+2d=0

a+3d=6

d=6

a=6-3(6)

a=6-18

a= -12

a+(n-1)d

= -12+(n-1)6

= -12+6n-6

= -18+6n