HELP! (WILL MARK BRAINLIEST!)

Step-by-step explanation:

Step 1:  Identify the blanks

and

f · g =

      =

      =

      =

Since the g(x) is in the inside, that is what goes in first to produce the f(2x + 4).  Now we put in (2x + 4) into the x of the f(x) function.  

This produces:    

Now, we just combine like terms to get:  

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.