Use reference angles to find the exact value of the expression. Do not use a calculator.cot 390°
A. 
B. - 
C. - 
D. 
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
Write the negation of the statement. Remember that the negation of p ? q is p ? ~q.If the box is in the mail, then it will be here by Tuesday.
A. The box is not in the mail and it will not be here by Tuesday. B. The box is in the mail, so it will be here by Tuesday. C. The box is in the mail and it will not be here by Tuesday. D. If the box is in the mail, then it will not be here by Tuesday.
Find the exact value of the expression.cot-1 
A. 
B. 
C. 
D. 
Find the coordinates of the vertex and x-intercepts for the quadratic function.f(x) = x2 + 6x + 8
A. vertex (-3, 1) x-intercepts (-2, 0), (- 4, 0) B. vertex (-3, -1) x-intercepts (-2, 0), (- 4, 0) C. vertex (3, -1) x-intercepts (2, 0), (4, 0) D. vertex (3, 1) x-intercepts (2, 0), (4, 0)