I don't know how to do this. Can I get help in the most fastest way possible but easy for me to understand, thanks!

Let's find  g(16) .

 

g(x)  =  √x

                           Plug in  16  for  x .

g(16)  =  √16

 

g(16)  =  4

 

Now let's find t(4) .

 

t(x)  =  3 - g(x)

                           Plug in  4  for  x .

t(4)  =  3 - g(4)

                           And  g(4)  =  √4  =  2   so we can substitute  2  in for  g(4)

t(4)  =  3 - 2

 

t(4)  =  1

 

So.....

 

t( g(16) )  =  t( 4 )  =  1