Answer
$400$ thousand
We expect that the number of housing starts per year in the U.S. will eventually level off at a value of $400,000$ housing starts per year.
Work Step by Step
$t$ is "approaching $+\infty$" means that $t$ is assuming positive values of greater and greater magnitude.
See table below.
As $t$ assumes positive values of greater and greater magnitude, the function value approaches the value $400$.
So, we write:
$\displaystyle \lim_{t\rightarrow\infty}n(t)=400$
Thus, we expect that the number of housing starts per year in the U.S. will eventually level off at a value of $400,000$ housing starts per year.
