Posted by Nkululeko Hadebe on Tuesday, April 10, 2012 at 11:28am.
Determine the 10th and 21st terms of the arithmetic sequence 4+7x, 5+9x, 6+11x

arithmetic  Steve, Tuesday, April 10, 2012 at 3:33pm
5+9x  (4+7x) = 1+2x
a = 4+7x
d = 1+2x
T10 = a+9d = 4+7x + 9(1+2x) = 13+25x
T21 = a+20d = 4+7x + 20(1+2x) = 24+47x

arithmetic  Mfuno, Sunday, January 19, 2014 at 3:57pm
T10 = 4 + 7x +(101)1+2x
= 4 + 7x +9(1+2x)
= 4 + 7x +9+18x
= 13+25x
T21 = 4+7x +(211)1+2x
= 4+7x +20(1+2x)
= 4+7x +20+40x
= 24+47x
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