We need to follow PEMDAS.
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction
[tex]10^2 + 4\times 9 -2^3[/tex]
First take care of all the exponents.
[tex]100 + 4 \times 9 - 8[/tex]
Now do the multiplication.
[tex]100 + 36 - 8[/tex]
Now add and subtract from left to right.
[tex]136 - 8[/tex]
[tex]128[/tex]
Your final answer is 128.