Answers

2016-06-29T20:05:15+08:00
Use the formula: a sub n= a sub 1 + (n-1)d ; where in a sub n is the last term, a sub 1 is the 1st term, n is the number of terms, and d is the common difference.

or use the formula: Sum of the terms= n/2 (2 a sub 1 + (n-1)d) or Sum of the terms= n/2 (a sub 1 + a sub n)

use the second sum formula..
530=10/2 (a sub 1 + 80)
530= 5 (a sub 1 + 80)
530= 5(a sub 1) + 400
530-400= 5(a sub 1)
130= 5 (a sub 1)
130/5= a sub 1
26= a sub 1

the first term is 26. now u have the first term...

use the first arithmetic formula...

80= 26+(10-1)d
80= 26 + 9d
80-26= 9d
54= 9d
54/9=d
6=d

the common difference is 6...

those are the answers...
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salamat po mabuhay ka
ate/kuya sa formula po tabi ng a1 is 2 pero na wala na po sa solution
yung second formula yung ginamit ko which is sum of the terms= n/2(a sub 1 + a sub n)...