Answer:
6+18
Explanation:
Use PEMDAS, or standard order of operations for basically all levels of math.
In order from first to last, solve:
Parenthesis
Exponents/Roots
Multiplication/Division
Addition/Subtraction
Exponents, Multiplication, or Addition are not to be prioritized over Roots, Division, or Subtraction. Solve left to right in that situation.
Because 6+18 is in parenthesis, solve that first.