Refer to the following normal curve, with mean ? and standard deviation ?.
A data value of 60 corresponds to a standardized value of
A. -2.
B. 0.
C. -40.
D. -1.
E. none of these
Answer: D
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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)
Solve the problem.A window washer accidentally drops a bucket from the top of a 144-foot building. The height h of the bucket after t seconds is given by 
When will the bucket hit the ground?
A. 3 sec B. 48 sec C. -3 sec D. 9 sec
Solve the problem.If m varies directly as p, and m = 20 when p = 5, find m when p is 8.
A. m = 16 B. m = 25 C. m = 32 D. m = 64
Perform the indicated operation. 
÷ 10
A. 
B. 
C. 
D. 