The answer is w*v*1/2*6. All you did is rearrange the numbers. (moved the 6 to the other side, which does not affect anything)
1.

4 + 7 or 4 - 7 = 11 or -3
2.
pi is a real number. It is not imaginary or complex, so it definitely belongs to the set of real numbers.
pi is not a whole number or a rational number. It cannot be written as a fraction of integers. pi is irrational.
Therefore, pi is real and irrational.