1 & 2 &3 all indicate the value of 6
As per given in question, T is mid - point of QP ; so the measures QT and TP are equal.
that is :
Value of x is 6, so correct choice is D
If you mean you need the volume then you would multiply length x width x hight
I don't quite understand yet, but I think you have to count the squares on the line between the letters. Does this help?