Solve for a4 a_4=5(3)^(4-1)

$a_{4} = 5 {(3)}^{4 - 1}$

Subtract $1$ from $4$ .

$a_{4} = 5 \cdot 3^{3}$

Raise $3$ to the power of $3$ .

$a_{4} = 5 \cdot 27$

Multiply $5$ by $27$ .

$a_{4} = 135$

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