Question 1130810
If {{{p + q < r - t < w - v}}}, and {{{z < 0}}}, 

which of the following must be false?
 
I. {{{zr - zt > zp + zq }}}.....substitute {{{z}}} with {{{-1}}}

{{{-r -(-t) > -p -q }}}
{{{t-r > -(p + q )}}}--> if {{{-(p + q )}}} is < than {{{(p + q )}}} would be > tan {{{t-r}}} or {{{-(r-t)}}} 


II. {{{zp + zq < zw - zv }}}...........same way do the other two


III. {{{zr - zt > zw - zv }}}

answer:

 I and II are false