The following $6$ summation questions $(Q1$ to $Q6)$ are based on the table below:

$\backslash$table$[[,,x_{?},$Y$],[,,7,-4],[,,-3,],[,,-2,],[,,1,],[,,4,],[$Q$1$:$,xY,,],[$Q$2$:$,(x-2Y),,],[$Q$3$:$,Y^2+10,,],[$Q$4$:$,(x{)}^2+Y,,],[$Q$5$:$,xY,,],[$Q$6$:$,(x)-(Y),,]]$