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Substituting and evaluating algebraic expressions questions and answers

What is the value of #frac{2x+3y+4z}{(yz)^2}# . If x=2, y=#x/2# and z=3y?
A.9
B. #6 1/3#
C. #3 1/6#
D. #2 1/9#

(3m 35s)

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