Question 1

(a) 2 ^ 24 = 16777216
(b) (4000 * 3000 * 24) / (8 * 1024 * 1024) MB = 34.33 MB
(c) Width = 4000 / 500 = 8 inches
Height = 3000 / 500 = 6 inches

Question 2

(a) Clone Tool
(b) Copy and Paste
(c) Magic Wand Tool + Inverse Selection
(d) Eyedropper Tool