Step-by-step explanation:
This is just a matter of multiplication. 4t x 5t = [tex]20t^{2}[/tex], so that will be in your first box. 4t x -4 = -16t, so that'll be in your second box. 5 x 5t = 25t, so that will be in your bottom-first box, and 5 x -4 = -20, so that will be in your last one.
