Posted by dany on .
determine the secon termof an A.P whose sixth term is 12 and eighth term is 22?

arithmetic 
Elena,
a(n) = a₁ +(n1)d
a(6) = a₁ +(61)d=12
a(8) = a₁ +(81)d=22
a₁ +5d=12
a₁ +7d=22
a₁ = 13
d=5
a(2) = a₁ +(21)d=
=13 +5= =8