The question is given to be:
[tex](9+3)+9[/tex]Following the PEMDAS order of operations:
Step 1: Calculate within the parenthesis.
[tex](9+3)=12[/tex]Step 2: Add the numbers from left to right.
[tex]\Rightarrow12+9=21[/tex]ANSWER:
[tex](9+3)+9=21[/tex]