find the s20 of the arithmetic sequence
-8, 1, 10, 19, ...
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find the s20 of the arithmetic sequence-8, 1, 10, 19, ...
find the s20 of the arithmetic sequence
-8, 1, 10, 19, ...
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Answer: 179
Step-by-step explanation: A1= -8, d=39-10=9 , a20= ?
An= A1+ (n-1) d
A20= -8 + (20-1) 9
A20= -8 + (19) 9
A20= -8 + 171
A20= 179