The equation gives the position s = f(t) of a body moving on a coordinate line (s in meters, t in seconds). s (m)
When is the body standing still?
A. 8 < t ? 10
B. 2 < t < 3, 4 < t < 5, 7 < t < 9
C. t = 3, t = 5, t = 8
D. 1 < t < 2
Answer: D
Mathematics
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Use reduction formulas to evaluate the integral.
A. 
sec2 6x tan 6x + 
ln
+ C
B. 
sec 6x tan 6x + 
ln
+ C
C. 
sec 6x tan 6x - 
ln
+ C
D. 
sec 6x tan 6x + 
ln
+ C
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Solve the problem.How many ways can a class president, a class secretary, and a class treasurer be chosen from a group of 5 candidates?
A. 15 B. 60 C. 12 D. 120
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Solve the equation.97x + 3 = 27
A. 
B. 
C. 
D. 
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Find the equation of the least squares line.The paired data below consist of the temperatures on randomly chosen days and the amount a certain kind of plant grew (in millimeters). 
A. y = 7.30 - 0.112x B. y = -14.6 - 0.211x C. y = 14.6 + 0.211x D. y = 7.30 + 0.122x
Mathematics