Question

determine a soma dos 11 primeiros termos da pa (5,8...)​

Answer 1

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$\sf{a_{11}=a_2+9r}\\\sf{a_{11}=8+9\cdot3}\\\sf{a_{11}=8+27}\\\sf{a_{11}=35}\\\sf{S_{11}=\dfrac{11\cdot(5+35)}{2}}\\\sf{S_{11}=\dfrac{11\cdot\diagdown\!\!\!\!\!\!40^{20}}{\diagdown\!\!\!\!2}}\\\sf{S_{11}=11\cdot20}\\\huge\boxed{\boxed{\boxed{\boxed{\sf{S_{11}=220}}}}}$