Question

Calcule o 10º termo da PA (-11, -8, -5,...)​

Answer 1

$r=a_{2} -a_{1} =-8-( -11) \Longrightarrow r=3 \\ \\ \therefore a_{10} =a_{1} +9r=-11+9\cdotp 3\Longrightarrow a_{10} =16$