Provide an appropriate response.Decide whether the elimination method or the substitution method involves the least amount of work. Do not solve. 7x + 5y = -78 5x - 2y = -39
A. Substitution
B. Elimination
Answer: B
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Determine if the series converges or diverges; if the series converges, find its sum.
A. Converges; 
B. Converges; 
C. Converges; 
D. Diverges
Find the indicated sum or difference, if it is defined.[-2 9 1] - [4 3]
A. not defined B. [-6 6 1] C. [-6 6 -2] D. [-6 9 -2]
Solve the problem.The sales of a mature product (one which has passed its peak) will decline by the function S(t)= Soe-at, where t is time in years. Find the sales after 18 years if 
and 
(Round to the nearest whole number.)
A. 67,355 B. 2,059,009 C. 1822 D. 911
Find the domain and range of the function represented in the graph.
A. Domain: (-?, ?); Range: (-?, ?) B. Domain: (-?, ?); Range: [-4, ?) C. Domain: [-1, ?); Range: [-4, ?) D. Domain: (-?, -1) or (-1, ?); Range: (-?, -4) or (-4, ?)