p=3

Explanation:

We can write the equation from this word problem by looking at each part of the question.

"The difference of" is saying to subtract what follows.

"a number p and -9 means we have to subtract -9 from p.Remember, we need to subtract a minus 9 or negative nine - so minus a negative number.

We can write this as p-\ -9

In math the word "is" means equal to or =.

And the expression is equal to 12.

Writing the entire problem out gives:

p+9=12

We can rewrite as:

p+9=12

p+9-9=12-9

p+0=3

p=3

Explanation:

We can write the equation from this word problem by looking at each part of the question.

"The difference of" is saying to subtract what follows.

"a number p and -9 means we have to subtract -9 from p.Remember, we need to subtract a minus 9 or negative nine - so minus a negative number.

We can write this as p-\ -9

In math the word "is" means equal to or =.

And the expression is equal to 12.

Writing the entire problem out gives:

p+9=12

We can rewrite as:

p+9=12

p+9-9=12-9

p+0=3

p=3