67.720541 multiply 19 by 3.564239
Sum means add, a number means x, and four means, uh, 4...
x+4. is what you're looking for
Answer:

Step-by-step explanation:
Required
Determine the sets of natural number
Represent this set with letter N
From definition of natural numbers, they are integer numbers starting from 1;
In other words: 1,2,3,4,5, and so on.
To represent this as a set of N, we have

<em>The ..... means that the counting still continues</em>
Step by step, meaning explaining the equation right and answer?