Convert the unit. of length​

What is the inverse of the function f(x) = 2x + 1?

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

The dolphins at the webster are fed 1/2 of a bucket of fish each day the sea otters are fed 1/2 as much fish as the dolphins how many buckets of fish are the sea fed each day? simplify you answer and write it as a proper fraction or as a whole or mixed number