Question 1046722
 {{{ z varies jointly as the square root of the product of x and y. Ij z=3 when x=3 and y=12, find x when z=6 and y=64 }}}.


What you placed inside the rendering tags does not properly nor completely display:
 <i> z varies jointly as the square root of the product of x and y. Ij z=3 when x=3 and y=12, find x when z=6 and y=64 .</i>


What is the "Ij"?


The description makes for this:
{{{z=k*sqrt(xy)}}}, the first sentence.
k is a variation constant.


The two parts of the second sentence are these.
{{{system(x=3,y=12,z=3,k=unknownCanBeFound)}}}
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{{{system(x=solveForThisNow,y=64,z=6,k=NowKnown)}}}
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Solve first for k and evaluate.
Next, solve for x and evaluate.