Train Up Mathematics S1 to S2

Hope you can answer me four questions! (Train Up Mathematics S1 to S2)

page56 11. Find the total surface area and the volume of the prism.
(Note: The surface of the prism are 4 rectangles and 2 trapeziums.)

page66 Open-ended Question
In the figure, triangle ABC is an isosceles triangle with AC=BC.
(a) Find the coordinates of B and C.
(b) Find the area of triangle ABC.

page4 Learning from Mistakes
There are mistakes in the shaded parts. Make necessary corrections.
1. Solve x-3<_ 2x+4
x-2x<_4+3
-x<_7
x<_-7

page96 Open-ended Questions
2. A carpenter cuts a cube into two solids as shown below. He thinks that since the surface area of the concave part (the shaded part) of solid A equals the surface area of the convex part (the shaded part) of solid B, the total surface areas of the two solid are the same. Do you agree with him? Explain your answer briefly.

Thank you for helping me !