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math league real world application problem, help smart people?

1. Suppose that the daily demand (in pounds) for chocolate candy at $x per pound is given by D = 1000 - 40x^2 ; 1 ≤ x ≤ 5 If the price is increased from $3.00 to $3.20 per pound what is the approximate change in demand? 2. A drug is given to a patient to dilate her arteries. If the radius of an artery is increased from 2 to 2.1 mm, approximately how much is the cross-sectional area increased [assume that the cross of the artery is circular; that is, A=(pi)r^2

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1. 1) from 640 to 590.4 2) 2.1*2.1/(2*2) or 1.1025 _