When you have two variables next to eachother, that means to multiply. So that's the same as
\(A=L*W\)
They give that \(L = 12\) and \(W = 6\)
So now you plug \(L\) and \(W\) into the equation:
\(A=12*6\)
If you multiply \(12*6\) you get \(72\)
So your final answer is 72!
