I found my notes for this exact paper and I have that first problem written. hopefully this helps
-7, because you distribute it to both -4 and 3.2, which means you're multiplying it to both.
Answer: 1073741824 because 2x4 is 8 and 8 to the power of 10 is 1073741824
9 9x5=45
5,10,15,20,25,30,35,40,45
9
(x+8)(x-3) have a great day