Solve the problem.The product of two consecutive odd integers is 195. Find all pairs of integers that satisfy this condition.
A. -15 and 15
B. -15 and 13, -13 and 15
C. -15 and 13
D. -15 and -13, 13 and 15
Answer: D
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New telephone lines must be installed to connect 9 cities (A, B, C, D, E, F, G, H and J). Due to government regulations, the only possible connections that are allowed are shown by the edges on the network below. The numbers on the edges indicate the cost (in millions of dollars) of each possible connection. The telephone company wishes to connect the cities in the cheapest possible way.
Using Kruskal's algorithm, which edge is chosen second to last?
A. DE B. BC C. AB D. EH E. none of these
Solve.Two swimmers are swimming in opposite directions. One is swimming at a speed of 2 m/sec. and the other is swimming at a speed of 2
m/sec. If we begin a stopwatch at the time that they pass each other, then how long will it take them to get 47 m apart?
A. 20
sec.
B. 11
sec.
C. 10
sec.
D. 9
sec.
Shade the solution set in the xy-plane.y ? -x2 - 6x - 4y ? x2 + 6x + 4
A. 
B. 
C. 
D. 
Solve using the multiplication principle.-3a = 6
A. 1 B. -2 C. 9 D. -9