Answer :
Answer:
11.2
Explanation:
To perform the operation given, we use PEMDAS.
Parenthesis comes first; therefore,
[tex]18.9\lbrack5.4-4.6\rbrack-2^2[/tex]Exponents come second:
[tex]18.9\lbrack5.4-4.6\rbrack-4[/tex]parenthesis again
[tex]18.9\lbrack0.8\rbrack-4[/tex]multiplication next
[tex]15.12-4[/tex]and finally, subtraction
[tex]11.2[/tex]which is our answer!