Hierarchy of arithmetic operations
?
% 1. The contents of all parenthesis are evaluated, starting from the
%???? innermost parentheses and working outward.
% 2. All exponentials are evaluated, working from left to right.
% 3. All multiplications and divisions are evaluated, working from left to
%?????? right.
% 4. All additions and subtractions are evaluated, working from left to
%????? right.