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Answer

a) 1.32m = 132cm
132 ÷ 6 = 22
David cut out 22 strips from the cardboard.

b) Up to Strip Total Length
           1st              30cm
          2nd             30 + 21 cm          = 30 + 21x(2-1)
           3rd             30 + 21 + 21 cm = 30 + 21x(3-1)
         22nd                                             30 + 21x(22-1) = 471 cm

Length of long strip is 471cm.

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