Suppose $h(x)=k(1.8^x+1.8^e)$, where $k$ and $e$ are positive integers with $k<e$. Two functions, $r(x)=k(1.8^x+j)$ and $s(x)=k(1.8^x)+t$, are defined where $j$ and $t$ are constants.
The functions r and s are equivalent to function h.
Which of these forms displays the y-coordinate of the y-intercept of $y=h(x)$ as a constant or coefficient?