Solve the problem.A field microphone used at a soccer game has a parabolic cross section and is 20 inches wide at the opening. The focus is 9 inches from the vertex. Find the depth of the microphone.

A. 11.11 in.
B. 44.44 in.
C. 2.78 in.
D. 1.23 in.


Answer: C

Mathematics

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Identify equilibrium values and determine which are stable and which are unstable. = (y + 2)(y + 1)

A. y = 2 is a stable equilibrium value and y = 1 is an unstable equilibrium. B. y = 1 is a stable equilibrium value and y = -2 is an unstable equilibrium. C. y = -2 is a stable equilibrium value and y = 1 is an unstable equilibrium. D. y = -1 is a stable equilibrium value and y = 2 is an unstable equilibrium.

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Subtract. - 

A.  
B.  
C.
D.  

Mathematics

Write a word name for the given decimal notation.2.4

A. Two and four hundredth(s) B. Two and four millionth(s) C. Two and four tenth(s) D. Two and four thousandth(s)

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Find the indicated intercept(s) of the graph of the function.y-intercept of f(x) = 

A.
B.
C. (0, 12)
D. none

Mathematics