Find a general term an for the arithmetic sequence.a1 = 2, d = -4
A. an= -4n + 6
B. an= -6 - 4n
C. an= 4n - 2
D. an= -4n - 2
Answer: A
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Solve the problem.Find the center of mass of a tetrahedron of constant density bounded by the coordinate planes and the plane 
.
A. 
= 2, 
= 
, 
= 
B. 
= 1, 
= 
, 
= 
C. 
= 
, 
= 
, 
= 2
D. 
= 
, 
= 
, 
= 4
Find an equation of the line containing the given pair of points
and 
A. y = 
x + 
B. y = 7x - 
C. y = 
x + 
D. y = 7x - 
Solve the problem.The population P, in thousands, of Prairie Grove is given by P = 
, where t is the time, in months. Determine the interval on which the population was greater than or equal to 40 thousand.
A. (-?, ?) B. [0.83, 5.42] C. [0.664, 4.336] D. [4.336, ?)
Find the special product.[(5x - 4) + 8y][(5x - 4) - 8y]
A. 25x2 - 40x + 16 + 64y2 B. 25x2 + 40x + 16 - 64y2 C. 25x2 - 40x + 16 + 80xy - 64y + 64y2 D. 25x2 - 40x + 16 - 64y2