Question

determine os 7° termo da pa (-1, 1...)

Answer 1

Razão(r)=1-(-1)=>2
Primeiro termo(a1)=-1

$a_n=a_1+(n-1)r\\a_7=-1+(7-1)\cdot2\\a_7=-1+(6\cdot2)\\a_7=-1+12\\\\\boxed{\boxed{a_7=11}}$