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Unit 26 Algebraic Expressions and Equations
Part 4 Exponents
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PP 27 Part
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Practice Problems
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Mathematics Internet Library
Evaluate the following expressions for x = 2, y = 4, and z = 3.  
1) 3x + 4

2) x^{2} + z^{2}  3) 4y  x^{2}  4) 3x + 2y  4 
5) 4xy  z

6)  
Solve these equations and ckeck your answer.  
7) y  4 = 3

8) y + 5 = 15  9) 3y = 24  10) 
11) Mark's dad is four times as old as
Mark. His dad is 28. Find Mark's age
using an equation.

12) Write an expression for seven decreased by 2 times a number.  
Quick Notes stars problems 11 and 12. Students have been told
that starred problems are very difficult. 