Question 1159887
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From the apparent answer choices, I can GUESS what we are supposed to do with this problem....<br>
But it is not our responsibility to guess the meaning of your question; it is your responsibility to present the problem so it is clear.<br>
Re-post if you want us to help you with this....<br>
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I'm sorry you were given the problem in this form.  Presumably it came from an educator; you would think an educator would know how to speak/write English.<br>
The intent of the problem is to have you determine if a numerical value for the given expression can be found knowing...
A) (1) only
B) (2) only
C) (1) and (2)
D) (either) (1) or (2) alone
E) none of the above<br>
Certainly (1) alone is not enough -- you still know nothing about x or z.  So answers A and D are both not right.<br>
With (2) alone, you can get x and z in terms of y to get an expression in y alone:<br>
{{{z = y^2}}}
{{{x = 2z = 2y^2}}}<br>
{{{(x^2y-y^z)/(y^2) = (((2y^2)^2)y-y^(y^2))/y^2}}}<br>
But to get a value for the expression, you need a value for y.  So you need both (1) and (2) to find a value for the expression.<br>
So the answer is C.<br>