HP 35s Scientific Calculator - Manual (Page 117)

Entering and Evaluating Equations 6-15
So, for example, all operations inside parentheses are performed before operations
outside the parentheses.
Examples:
Order Operation Example
1 Parentheses 
2 Functions 
3 Power (  ) 
4 Unary Minus (  ) 
5 Multiply and Divide , 
6 Add and Subtract , 
7 Equality 
Equations Meaning
 a × (b 3 ) = c
 (a × b) 3 = c
a + (b/c) = 12
(a + b) / c = 12
 [%CHG ((t + 12), (a – 6)) ] 2