Question
If the 4th term of an arithmetic sequence is 24 and the 12th term is 56, whats the first term?
Answers
Reiny
done
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why are you switching names?
http://www.jiskha.com/display.cgi?id=1467199616
why are you switching names?
Harish
a+11d=56---->1
a+3d=24----->2
1-2 we get
8d=32
d=4
put d=4 in 2
a+3(4)=24
a+12=24
a=24-14
a=10
a+3d=24----->2
1-2 we get
8d=32
d=4
put d=4 in 2
a+3(4)=24
a+12=24
a=24-14
a=10