3 years ago

Consider the sequence 20, 14, 8, 2, -4, ....

1 answer:

nataly862011 [7]3 years ago

8 0

$(a)\quad a_{n+1}=a_n-6\\\\(b)\quad a_1=20,\ d=2-8=-6\implies a_n=20+(-6)(n-1)\\\\{}\qquad a_n=-6n+26\\\\(c)\quad a_{30}=-6\cdot30+26 = -154$

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