Chapter 0.2, Problem 4E

a)

To determine

The property used for the expression $-e\cdot 1=-e$.

b)

To determine

The property used for the expression $4+\left(-4\right)=0$.

c)

To determine

The property used for the expression $\left(\frac{3}{2}\right)\left(\frac{2}{3}\right)=1$.

d)

To determine

The property used for the expression $12\left(\frac{3}{4}\right)=\left(\frac{3}{4}\right)\left(12\right)$.