Question

Fifteen more than a number is written as...?

Answer 1

x+15

Explanation:

Since it says "than a number"

What number is it?

We don't know.

We will say thats a variable.

What variable?

Well it really can be anything. ONLY LETTERS

Lets do a x

Now the problem changed.

Fifteen more than x is written as...?

It says "more"

You use plus.

Now the problem changed.

Since is written as... is your answer so yeah

15+x is the problem.

There you go the answer!

People writes the variable first so:

x+15

The answer is x+15

Answer 2

x + 15

Explanation:

Since I don't know what this number is, I'm going to use the variable x to substitute for the value of the unknown number.

So it would just be x + 15 because addition is the operation of adding and the key words are usually more. Since one of the numbers is unknown, we can't get an answer like "100" because x is undefined.

Say x=100, then the number would be written as 115 in it's simplest form but you could also write it as 100+15. So I'm just using substitution.