Solve the problem.The number of edges in the complete graph with 50 vertices is
A. 
.
B. 
.
C. 50!.
D. 49.
E. none of these
Answer: A
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Solve the equation. If the solutions involve square roots, give both the exact solutions and the approximate solutions to three decimal places.3m2 + 10m + 4 = 0
A. 
? -0.232, 
? -1.434
B. 
? 0.361, 
? -3.694
C. 
? -0.465, 
? -2.869
D. 
? -2.131, 
? -4.535
Identify the operation to perform on each side of the equation to isolate the variable.t + 3 = 15
A. Add 15 B. Subtract 3 C. Subtract 15 D. Add 3
Solve the problem.The manager of a small retail store counted the number of sales each hour during a 60-hour week. The frequency distribution is given below. 
Find the relative frequency of seven sales during an hour.
A. 
B. 
C. 
D. 
E. none of these
Solve the equation using an integrating factor.y' + t2y = 4t2, t > 0
A. y = 4x + Ce-t2/2 B. y = 4 + Ce-t3/3 C. y = 4 + Ce-t2/2 D. y = 4x + Ce-t3/3