Question 1141806
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None of the answer choices in anywhere close to right, because you didn't use parentheses correctly.<br>
(y^2*10^-4)*(z*1000000)/(y*0.0001)*(z*10^6)<br>
Each expression in parentheses is a single number.  The operations in the expression, left to right, are multiply, divide, and multiply.  Those operations have equal priority; they are performed in order, left to right.<br>
{{{(y^2*10^-4)*(z*1000000) = (1000000z)*(.0001y^2)}}}
{{{((1000000z)*(.0001y^2))/(y*0.0001) = 1000000yz}}}
{{{1000000yz*(z*10^6) = y(z*10^6)*(z*10^6) = yz*10^12}}}<br>
The expression you probably meant to show is<br>
(y^2*10^-4)*(z*1000000)/((y*0.0001)*(z*10^6)), or<br>
{{{(y^2*10^-4)*(z*1000000)/((y*0.0001)*(z*10^6))}}}<br>
In this (probably) correct form, it is easy to see that the expression is equal to just "y".<br>
But that is not one of your answer choices; so it appears the problem is flawed, or you have not shown it correctly.