Answer:
[tex]\Huge \boxed{\mathrm{20}}[/tex]
Step-by-step explanation:
[tex]\Rightarrow \displaystyle \frac{1}{5} \cdot (6+3+1)^2[/tex]
Solve for the brackets or parenthesis first.
Adding the terms in the brackets or parenthesis.
[tex]\Rightarrow \displaystyle \frac{1}{5} \cdot (10)^2[/tex]
Solving for the exponent or power.
[tex]\Rightarrow \displaystyle \frac{1}{5} \cdot (100)[/tex]
Multiplying both terms.
[tex]\displaystyle \Rightarrow \frac{100}{5} \\ \\ \\ \\ \Rightarrow 20[/tex]
