The pictograph shows the number of bicyclists who participated in the Labor Day weekend bicycle race for the years indicated. In what years did more than 70 cyclists participate?

A. 2001, 2002, 2003, 2006, 2007
B. 2003, 2006, 2007
C. 2001, 2003, 2006, 2007
D. 2003, 2007

Answer: C

Mathematics

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Solve the problem.In one study, a type of fish was exposed to a toxin. The table lists toxin concentrations in the fish after a certain number of hours. The concentration C of the toxin in the fishes' bloodstream was measured in micrograms of toxin per gram of fish after x hours of exposure. (i) Describe the relationship between x and C; (ii) Use regression to find a cubic polynomial function f(x) that models the data; (iii) graph C and the data; (iv) Concentrations above 30 are lethal to the fish. Determine how many hours of exposure it takes for this to occur.

A. (i) As x increases, C increases;
(ii) f(x) ? 0.38x³ - 4.35x² + 22.97x - 33.40
(iii)

(iv) x ? 6.0 (approximately)
B. (i) As x increases, C increases;
(ii) f(x) ? 0.38x³ - 5.35x² + 24.97x - 33.40
(iii)

(iv) x ? 9.1 (approximately)
C. (i) As x increases, C increases;
(ii) f(x) ? 0.28x³ - 5.35x² + 22.97x - 33.40
(iii)

(iv) x ? 6.2 (approximately)
D. (i) As x increases, C increases;
(ii) f(x) ? 0.28x³ - 4.35x² + 24.97x - 33.40
(iii)

(iv) x ? 7.9 (approximately)