Trent508 Trent508

02-09-2014
Mathematics

Answered

The 10th and the 20th term of an arithmetic sequence are 10 and 40, respectively. Find its 100th term.

Verified Answer :

crisforp crisforp

02-09-2014

a 10 = 10;
a 20 = 40;
a n = a 1 + ( n - 1) r => 10 = a 1 + 9 r, and, 40 = a 1 + 19 r => 30 = 10 r => r = 3 => a 1 = 10 - 27 => a 1 = -17;
a 100 = a 1 + 99 r => a 100 = - 17 + 99 3 => a 100 = -17 + 297 => a 100 = 280.

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