SubstitutionSubstitute the given values into the algebraic expressions in this self marking quiz. 
This is level 1: . Here are some mathematical expressions.
Can you evaluate them if s = 2, b = 6, t = 5 and n = 9
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Level 1  Simple addition and subtraction  positive integers
Level 2  Addition, subtraction and multiplication  positive integers
Level 3  Indices  positive integers
Level 4  Brackets  positive integers
Level 5  Mixed expressions  positive integers
Level 6  Mixed expressions  negative integers
Level 7  Mixed expressions  positive and negative decimals