The sum of 9 is -30. find the number

The sum of 9 and a number is -30.

If thats the question, here is the answer

Let the number be n

Then 9+n=-30

We now solve for n

9+n=-30

n=-30-9

n=-39

The number is -39

341

step-by-step explanation:

all you have to do is 9x31 (which equals 279) and then 20x31 (which equals 620). then you have to subtract. 620-279=341.