1). What is additive identity?2). What is Reciprocal?
3). What is multiplicative inverse?

Solution:
 

1). Additive Identity:

A value which is added to any number and the resulting value remains unchanged, is known as additive identity.

e.g. $x+0=x$

$\Rightarrow 0$ is the additive identity for any real number.

2). Reciprocal:

When a number is multiplied by any number such that the product is one , is known as Reciprocal of the number.

e.g. $x\times \frac{1}{x}=1$

Thus, $x$ and $\frac{1}{x}$ are the reciprocals of each other.

3). Multiplicative inverse:

Reciprocal and Multiplicative inverse mean the same.