SOLUTION: Find the 20th term of the arithmetic sequence in which A6=70 and A9=91.
One of the following is the correct answer. Which one?
A) 1061
B) 263
C) 175
D) 168
E) 133
Algebra.Com
Question 1198476: Find the 20th term of the arithmetic sequence in which A6=70 and A9=91.
One of the following is the correct answer. Which one?
A) 1061
B) 263
C) 175
D) 168
E) 133
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!
A9 is A6 plus the common difference 9-6=3 times:
91=70+3d
21=3d
d=7
A20 is A9 plus the common difference 20-9=11 times:
91+11(7)=91+77=168
ANSWER D)
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