Answer:
for the first function:
1)
f(x)=20-x
The inverse function is given as:
f(x)=y
20-x=y
i.e.
x=20-y
Hence, the inverse function satisfies the equation:
f(x)=20-x
2)
Now,
f(x)=y
Hence, the equation of inverse function is:
Hence, the graph of inverse function has asymptotes at x=1 and also passes through (0,0).
3)
f(x)=20x
f(x)=y
20x=y
so, the inverse function is:
Hence, the graph of this function is a straight line passing through (0,0)
4)
Let f(x)=y