Find the values of x for which the given function is concave up, the values of x for which the function is concave down, and any points of inflection.y = -2x2 - 4x - 5
A. Concave up for all x, no points of inflection
B. Concave down for all x, no points of inflection
C. Concave down for x < -1, concave up for x > -1, point of inflection at (-1, -3)
D. Concave up for x < -1, concave down for x > -1, point of inflection at (-1, -3)
Answer: B
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Give an appropriate answer to the question.A connected graph has 27 vertices and 38 edges. How many edges must be removed to form a spanning tree for the graph?
A. 37 B. 10 C. 11 D. 12
Determine if the sequence is geometric. If the sequence is geometric, find the common ratio.2, 
, 
, 
, . . .
A. yes, 4
B. no
C. yes, 
D. yes, 
Graph the function using its vertex, axis of symmetry, and intercepts.f(x) = x2 - 2x
A. vertex (-1, 1)
intercept (0, 2)
B. vertex (-1, -1)
intercepts (0, 0), (-2, 0)
C. vertex (1, 1)
intercept (0, 2)
D. vertex (1, -1)
intercepts (0, 0), (2, 0)
Evaluate the expression.274/3
A. 81 B. 243 C. 729 D. 2187