Im stuck on this problem.
Find the inverse function .
I know that y-4= sq root of t and now im stuck
$\displaystyle y = \sqrt{t} + 4$
swap variables ...
$\displaystyle t = \sqrt{y} + 4$
solve for y ...
$\displaystyle t - 4 = \sqrt{y}$
$\displaystyle (t-4)^2 = y$
have you learned about restricted domains for an inverse?
if not, don't worry about it now.