Solve the problem.Wind speed varies in the first twenty meters above the ground. For a particular day, let 
compute the wind speed Win meters per second x meters above the ground. At what height is the wind speed 12 meters per second? Round results to the nearest hundredth.
A. 1.75
B. 1.88
C. 0.17
D. 5.75
Answer: D
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Graph the quadratic function. Determine the vertex, find the equation of the axis of symmetry, find any x- and y-intercepts, and state the domain and range in interval notation.f(x) = -x2 - 4x - 3
A. vertex: (2, 1)
axis of symmetry: x = 2
x-intercepts: 1 and 3; y-intercept: -3
domain: (-?, ?); range: (-?, 1]
B. vertex: (-2, 1)
axis of symmetry: x = -2
x-intercepts: -1 and - 3; y-intercept: -3
domain: (-?, ?); range: (-?, 1]
C. vertex: (2, -1)
axis of symmetry: x = 2
x-intercepts: 1 and 3; y-intercept: 3
domain: (-?, ?); range: [-1, ?)
D. vertex: (-2, -1)
axis of symmetry: x = -2
x-intercepts: -1 and - 3; y-intercept: 3
domain: (-?, ?); range: [-1, ?)
Perform the indicated operation and write the answer in the form 
where a and b are real numbers.(3 + 4i) - (-6 + i)
A. -3 + 5i B. 9 + 3i C. -9 - 3i D. 9 - 3i
Find the current yield. Round to the nearest tenth of a percent.You invested $6225 in 100 shares of stock. During the following year, the company paid dividends of $2.75 per share.
A. 22.6% B. 0.4% C. 2.3% D. 4.4%
Find the real solutions, if any, of the equation. Use the quadratic formula.x2 - 4x - 15 = 0
A. {2 + 
, 2 - 
}
B. {-2 + 
, -2 - 
}
C. {2 + 
, 2 - 
}
D. {4 + 
, 4 - 
}