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Find the 20th term of the arithmetic sequence which first term is 11 and which seventh term is 77.


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IRINGANSHANAYAHJEANFGO

Answer:

1265 is the 20th term.

Step-by-step explanation:

Formula: An=A₁ + (n-1) d

A₁=first term

A₁=11

d=common difference

d=66 (77-11) (77-seventh term, 11-first term)

An=nth term

An=A₂₀

n=20

A₂₀=11 + (20-1)66

A₂₀=11 + (19)66

A₂₀=11 + 1254

A₂₀=1265

1265 is the 20th term.

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