6
Step-by-step explanation
The inverse of a function will reverse the output and the input. To find the inverse of a function using algebra (if the inverse exists), set the function equal to y. Then, swap x and y and solve for y in terms of x. in other words ( x an y change position)
so
for (7)
so, for h(x), when evaluating at (7) we got 6
hence, for the inverse it must happen the same, but y is the image, so
so, the answer is 6
I hope this helps you