Posted by Benjamin on Sunday, February 3, 2013 at 9:16am.
Given that 1st term of an A.P is 7 and it's 10th term is twice the second term,calculate the (a) 19th term (b)sum of 28 terms (c) difference between 9th and 6th terms

Math?  Writeacher, Sunday, February 3, 2013 at 9:17am
Statistics??
What's the SUBJECT??

Community technical college  bobpursley, Sunday, February 3, 2013 at 10:58am
a10=a1+r(101)
14=7+r(9)
r=7/9
check
7, 7 7/9, 7 14/9, 7 21/9, 7 28/9, 7 35/9, 7 42/9, 7 49/9, 7 56/9, 14
Use the formulas for sum, knowing r, a1

King george memorial college (Ilado Badagry Lagos state)  Michael Samuel, Sunday, October 11, 2015 at 3:35pm
1st term=7 2nd term=a+d
10term=a+9d
7+9d=2(14+2d)
147=9d2d
7=7d=d=1
sum of 28 term
n/2(2a+(n1)d)
28/2(2*7+(281)1)
14(14+27)=14(41)
25term=574
9th term=7+(91)1
7+(91)
7+8=15
6th term=7+(61)1
7+(61)=7+5=12
9th term6th term=1512=3.
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