Posted by Sequence and series on Saturday, November 26, 2011 at 9:20am.
The 4th term of an A.P.is 37 and the 6th term is 12 more than the 4th term.find the 1st and the 7th term of the sequence.

Core mathematics  Reiny, Saturday, November 26, 2011 at 9:44am
4th term is 37 > a + 3d = 37
6th term is 12 more than 4th term > a+5d = a+3d + 12
2d = 12
d = 6
then in a+3d = 37
a + 18 = 37
a = 19
first term is 19
7th term = a+6d = 127
check:
19 25 31 37 43 49
is 4th term 37 ? yes
is 6th term 12 more than 4th? yes

Core mathematics  angel, Saturday, November 26, 2011 at 9:44am
1 = 6.16 and 7= 43.12

Core mathematics  angel, Saturday, November 26, 2011 at 9:45am
i think

Core mathematics  angel, Saturday, November 26, 2011 at 9:47am
Reiny can u answer my other question please it is the latest one about the charity swim
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