Suppose we write down the smallest positive $2$-digit, $3$-digit, and $4$-digit multiples of $9$. What is the sum of these three numbers? I will mark you brainliest!

36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)