Answers and justitication:
1) (7x)^3 + 8→ 8 added to the cube of 7x
becasue the cube of 7x is (7x)^3 and then 8 is added to it.
2) (7x + 8)^3 → the cube of the sum of 7x + 8
because first you add 8 to 7x and then the result is cubed.
3) 7x^3 + 8 → 8 added to 7 and x cubed.
4) 7(x+8)^3 → 7 times the cube of the sum of x and 8.
because first 8 is added to 8, then the result is cubed, and finally the result is multiplied by 7.