Solve.An auditorium has 20 rows with 10 seats in the first row, 12 in the second row, 14 in the third row, and so forth. How many seats are in the auditorium?
A. 400
B. 620
C. 390
D. 580
Answer: D
Mathematics
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Give an appropriate answer.Let
f(x) = -2 and 
g(x) = -7. Find
[f(x) + g(x)]2.
A. 5 B. 53 C. -9 D. 81
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Find the derivative.y = - 6x6
A. - 36x6 B. - 6x5 C. - 36x7 D. - 36x5
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Sketch the graph of the quadratic function. Give the vertex and axis of symmetry.f(x) = -x2 - 5
A. vertex (5, 0); axis x = 5
B. vertex (-5, 0); axis x = -5
C. vertex (0, -5); axis x = 0
D. vertex (0, 5); axis x = 0
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The eccentricity is given of a conic section with one focus at the origin, along with the directrix corresponding to that focus. Find a polar equation for the conic section. e = 5, y = -8
A. r = 
B. r = 
C. r = 
D. r = 
Mathematics