1 . A rectangle is constructed with sides of length
3 8.4� 10 cm and
4 5.5� 10 cm .
( a ) Write down the area of the rectangle in the form a� 10 k , where 1�a
� 10 and k � .
Karen ’ s estimate of the area of the rectangle is
2
450000000 cm .
[ 2 ]
( b ) Find the percentage error in Karen ’ s estimate . [ 2 ]
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