Explanation

With demand function Qd = 12 - 2p the table is  completed as follows: 
(a) 

 Qd = 12 - 2p
 when p = 6
 Qd = 12 - (2 x 6)
= 12 - 12 = 0 

 Qd = 12 - 2p
 when p = 5
 Qd = 12 - (2 x 5)
= 12 - 10 = 2

 Qd = 12 - 2p
 when p = 4
 Qd = 12 - (2 x 4)
= 12 - 8 = 4

 Qd = 12 - 2p
 when p = 3
 Qd = 12 - (2 x 3)
= 12 - 6 = 6

 Qd = 12 - 2p
 when p = 2
 Qd = 12 - (2 x 2)
= 12 - 4 =   8

Qd= 12 - 2p
when p = 1 
Qd = 12 - (2 x 1)
= 12 - 2 = 10

 (b) The individual's demand curve

(c) 12

(d) Inverse, i.e., the higher the price, the lower the quantity demanded Or the lower the price the higher the quantity demanded. 
 

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