how do I write the equation for fifteen decreased by twice n equals 13?

Just translate the English into Math

"fifteen decreased by twice n equals 13"

15 - 2n = 13

To write the equation for "fifteen decreased by twice n equals 13," you need to break down the information given and translate it into mathematical language.

Let's start by translating "fifteen decreased by twice n." "Fifteen decreased by" means that you subtract something from fifteen, and "twice n" means two times n. So, the expression "fifteen decreased by twice n" can be written as:

15 - 2n

Now, we need to bring the "equals 13" part into the equation. This means that the expression on the left side of the equation should be equal to 13. Combining all the information, we can write the equation as:

15 - 2n = 13

That's it! You have successfully written the equation for "fifteen decreased by twice n equals 13."