i need help in math
Angelisa -- we'll be glad to help you. Please post one or two of the questions that are stumping you.
What is your question?
how old are you but my / is twelve added to a number equals 18 how do i write that
Twelve added to a number equals 18.
How do you write twelve?
What symbol is used for addition?
"A number" is our variable, so we can use n (or x if you prefer).
What symbols is used for equals?
Answer those questions, and you should be good to go.