Question

yes no? simplifying
1.2x^2 + 3x + 5x^2 - 4y A: 6 x^5 y^1
2.(4 x - 2 y) - (3 x + 8 y) does the answer start with 1 ?
3.5 x^3 y^4 z / 10 x y^2 z^3 A: x^2 Y^2/ 2 z^2
4.(x + 8) ( x -8 ) A: x^2 - 64
5.16 a b + 4 a b^4 + 24 b / 4 b A: 4 + b^3 + 6