given:
f(x) = 2^x-4
g(x) = 5/x
to find g(f(2))
firstly, lets find f(2) by substiting 2 for x in f(x)
f(2) = 2^2-4
= 2 ^-2
= 1/2^2 = 1/4
so, substituting 1/4 for x in g(x) to get g(f(2))
g(f(2)) = 5/1/4
= 5 divide by 1/4
= 5 X 4
= 20
Therefore g(f(2)) = 20