Question

What is the sum of a number and 9?

Answer 1

x+9

x --> the "number" (not determined)

9 --> what the problem gave

+ --> to put them together and form the sum

Answer 2

x + 9

Explanation:

Let,

The unknown number be = x

And ,

Given number to be added = 9

Hence,

The sum occurred = x + 9 (sum of a number and 9)