ok it y=mx+b it mean the slope to the line
The square root of 321 is 17.91 so it is about 18
$${\mathtt{9}}{\mathtt{\,\small\textbf+\,}}{\mathtt{10}} = {\mathtt{19}}$$
$${\mathtt{6}}{\mathtt{\,\times\,}}{\mathtt{2}} = {\mathtt{12}}$$
i think the answer is 330,300,000,000,000,000,000,000