Let w, x, and y be Boolean variables where the value of x is 1. For each of the following Boolean expressions, find out, if possible, the value of the expression. If you cannot determine the value of the expression, then find the number of assignments of values for w and y that will result in the value 1 for the expression.
a) x+xy+w
b) xy+w
c) xy +xw
d) xy+w