Solve the problem.Jane wants to buy a photocopier. The salesperson has the following information on three models. If all three are used, a specific job is completed in 50 minutes. If copier A operates for 20 minutes and copier B operates for 50 minutes, one-half of the job is completed. If copier B operates for 30 minutes and copier C operates for 80 minutes, three-fifths of the job is completed. Which is the fastest copier, and how long does it take this copier to complete the entire job working alone?
A. A is fastest; 120 minutes
B. B is fastest; 100 minutes
C. C is fastest; 120 minutes
D. C is fastest; 100 minutes
Answer: A
Mathematics
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Multiply or divide (as specified) the numerator and denominator by the given factor to obtain an equivalent fraction.
(divide by 2)
A. 
B. 
C. 
D. 
Mathematics
Simplify the expression. The result will be one of sin x, cos x, tan x, cot x, sec x, csc x.
A. cos x B. sin x C. tan x D. cot x
Mathematics
Establish the identity.7 csc2? - 5 cot2? = 2 csc2? + 5
What will be an ideal response?
Mathematics
Write the first four terms of the sequence.an = (-1)n(n + 9)
A. a1 = -10, a2 = 11, a3 = -12, a4 = 13 B. a1 = -10, a2 = -22, a3 = -36, a4 = -52 C. a1 = 10, a2 = 11, a3 = 12, a4 = 13 D. a1 = -10, a2 = -11, a3 = -12, a4 = -13
Mathematics