IDNStudy.com, ang iyong gabay para sa malinaw at eksaktong mga sagot. Ang aming platform ay nagbibigay ng mga maaasahang sagot upang matulungan kang gumawa ng matalinong desisyon nang mabilis at madali.

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


Sagot :

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.