Solve the problem.Which of the graphs described below must be a tree?
A. The students at Tasmania State University are the vertices; edges represent whether two students have had a class together or not.
B. An ancestry graph: Sets of parents are the vertices; birthparents are joined to their single-child offspring by edges.
C. A roadmap illustrating all of the towns and roads connecting them in Madison county.
D. all of these graphs must be trees.
E. none of these graphs must be trees.
Answer: B
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Find parametric equations for the line described below.The line through the point P(3, -3, 4) parallel to the vector 
A. x = 7t - 3, y = 3t + 3, z = -8t - 4 B. x = -7t + 3, y = 3t - 3, z = -8t + 4 C. x = -7t - 3, y =3t + 3, z = -8t - 4 D. x = 7t + 3, y = 3t - 3, z = -8t + 4
Provide an appropriate response.Using the markup formula M = S - C, find the selling price (S) if the markup (M) is $21.50 and the cost (C) is $58.
A. $79.50 B. $36.50 C. $3.62 D. $3.70
Provide an appropriate response.In the figure below, BD = 
AB, and DE = FC = 
AC. Prove that ?EDF ? ?ECF.
What will be an ideal response?
Write sigma notation.8 + 16 + 24 + 32 + 40 + . . .
A. 
B. 
C. 
D. 