Write a general formula to describe the variation.A varies directly with t2; A = 128 when t = 8
A. A = 16t2
B. A = 
C. A = 
D. A = 2t2
Answer: D
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Solve the problem. Round your answer, if appropriate.In a certain memory experiment, subject A is able to memorize words at a rate given by 
In the same memory experiment, subject B is able to memorize at the rate given by 
How many more words does subject B memorize from t = 0 to t = 15 (during the first 15 minutes)?
A. 19 B. -10 C. 12 D. -3
Factor the trinomial, or state that the trinomial is prime.15x2 + 4xy - 4y2
A. prime B. (3x + 2y)(5x - 2y) C. (3x - 2y)(5x + 2y) D. (15x + 2y)(x - 2y)
Use set notation to identify the shaded region.
?
?
A. 
B. 
C. 
D. 
E. 
Make a scatterplot of the data. Then find an exponential, logarithmic, or logistic function f that best models the data. Round function values to the nearest hundredth.
A. Logarithmic: f(x) = 1.39 + 4.86 ln x
B. Logistic: f(x) = 
C. Logarithmic: f(x) = 1.29 + 5.19 ln x
D. Logistic: f(x) = 