Solve the problem.A radio telescope has a parabolic surface. If it is 1 m deep and 20 m wide, how far is the focus from the vertex? 
A. 100 m
B. 5 m
C. 1 m
D. 25 m
Answer: D
Mathematics
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The position vector of a particle is r(t). Find the requested vector.The acceleration at t = 1 for r(t) = (9t - 3t4)i + (2 - t)j + (7t2 - 2t)k
A. a(1) = -36i - j + 14k B. a(1) = 36i + 14k C. a(1) = -9i + 14k D. a(1) = -36i + 14k
Mathematics
Match the inequality with its correct representation.{x | -8 ? x ? 4}
A. (-8, 4] B. (-8, 4) C. [-8, 4] D. [-8, 4)
Mathematics
Write the inequality using interval notation. Graph the inequality.2 < x ? 6
A. [2, 6]
B. (2, 6]
C. (2, 6)
D. [2, 6)
Mathematics
Graph.x2 + y2 + 10x + 8y + 25 = 0
A. 
B. 
C. 
D. 
Mathematics