So the problem is to find ? That has nothing to do with y.
Z is the uniform distribution from -2 to 2 so have value Z(z)= 1/4 for all z for all z between -2 and 2. is the same as . Those two intervals are disjoint so that is . And each of those is just 1/4 times the length of the interval.
There is a tutorial on "Latex" at Beginning LaTeX.
On this board start each latex code with [ tex ] and end with [ /tex ] (without the spaces)- or just press the key in the menu above.