Question

Q uestao 10. Determine ; a) a soma dos 10 primeiros termos da pa (2,5,. );.

Answer 1

Resposta:

155

Explicação passo a passo:

r = 5 - 2 = 3

$a_1_0=a_1+9r\\\\a_1_0=2+9.3\\\\a_1_0=2+27\\\\a_1_0=29\\\\S_1_0=\frac{(2+29).10}{2}\\\\S_1_0=31.5\\\\S_1_0=155$