How to do Multiplication of function by a scalar ? Explain it by giving example

What is Reciprocal of a function ? explain it by giving an example.

How to perform Addition subtraction multiplication division on Real function? Explain by giving example of each.

What do you mean by a precipitation reaction ? Explain by giving examples.

What do you mean by a precipitation reaction? Explain by giving examples.

What do you mean by a precipitation reaction? Explain by giving examples.