When both copying machines A and B are working, secretaries can make 91 copies in one minute. In one minute's time, copiers A and C together produce 85 copies, and all three working together produce 127 copies. How many copies per minute can each machine produce separately?
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Select the correct answer. (a, b, c are the productivity of the A, B, and C machines).
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A. machine A 49 copies, machine B 42 copies, machine C 36 copies
B. machine A 49 copies, machine B 42 copies, machine C 31 copies
C. machine A 44 copies, machine B 47 copies, machine C 36 copies
D. machine A 49 copies, machine B 47 copies, machine C 31 copies
E. machine A 44 copies, machine B 42 copies, machine C 41 copies
Answer: A
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Solve.How long will it take for the population of a certain country to double if its annual growth rate is 0.9%? Round to the nearest year.
A. 222 years B. 77 years C. 1 year D. 33 years
Subtract.- 
A. 3.89 B. 3.8859 C. 3.8869 D. 3.8868
Rewrite the logarithm log, 232 in terms of the common logarithm (base 10).
a. 
b. 
c. log232
d. log5log232
e. 
Determine the vertex, focus, and directrix of the parabola and sketch its graph.(x - 3)2 = 16(y - 2)
A. vertex: (3, 2)
focus: (3, 6)
directrix: y = -2
B. vertex: (2, 3)
focus: (2, 7)
directrix: y = -1
C. vertex: (3, 2)
focus: (3, -2)
directrix: y = 6
D. vertex: (-3, -2)
focus: (-3, 2)
directrix: y = -6