in an AP the C.D (d) and seventh term (a7)154 then find the first term
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a+d+a+6d=154
2a+7d=154 (1)
a+7d=154/2
a+7d=77
a+d=77/7
a+d=11
a=11-d (2)
2(11-d)+7d=154 from (1)
22-2d+7d=154
5d=154-22
5d=132
d=132/5
d=26.4
a=11-26.4 from (2)
a=7.26
First term of an ap is 7.26
2a+7d=154 (1)
a+7d=154/2
a+7d=77
a+d=77/7
a+d=11
a=11-d (2)
2(11-d)+7d=154 from (1)
22-2d+7d=154
5d=154-22
5d=132
d=132/5
d=26.4
a=11-26.4 from (2)
a=7.26
First term of an ap is 7.26
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