Simplify 4 · (1 + 3)^-1
4 · (1 + 3)^-1
\(4 *(1 + 3)^{-1}\\ =\frac{4 · (4)^{-1}}{1}\\ =\frac{4 }{1*(4)^{+1}}\\ =\frac{4 }{4}\\ =1 \)
