question 2B please answer this question

b) A right circular closed cylinder with radius r cm and height h cm is placed on a square block with sides 2r cm and height r cm. 2r 2r (i) If the total volume of the cylinder and square block is 30 cm', express h in terms of r. [2 marks] Page 2 of 3 (ii) Show that the total surface area of the square block and the cylinder is A = -+8r. Find the values r and h that minimize the total surface area. [7 marks] (iii) Determine the minimum total surface area. [2 marks]