[tex]\begin{gathered} \text{follow order or operations} \\ \text{PEMDAS} \\ \text{Parenthesis} \\ \text{exponent} \\ \text{Multiplication / Division} \\ \text{Additional / Subtraction} \\ =10\times10-50+30,\text{ use multiplication first} \\ =100-50+30,\text{ then simplify} \\ =50+30 \\ =80 \end{gathered}[/tex]
