The graph of a logarithmic function is shown. Select the function which matches the graph.
A. y = log x
B. y = log(-x)
C. y = -log x
D. y = -log(-x)
Answer: B
Mathematics
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Factor by grouping.20x2 + 15xy - 12xy - 9y2
A. (5x - 3)(4x + 3) B. (5x - 3y)(4x + 3y) C. (5x + 3y)(4x + 3y) D. (20x - 3y)(x + 3y)
Mathematics
Use the properties of logarithms to simplify the expression.ln cos ? - ln 
A. ln 4
B. ln 
C. ln 
D. ln cos ?
Mathematics
Solve the problem.An airplane is sighted at the same time by two ground observers who are 5 miles apart and both directly west of the airplane. They report the angles of elevation as 15° and 
How high is the airplane?
A. 3.98 mi B. 5.76 mi C. 1.87 mi D. 1.29 mi
Mathematics
Determine the quadratic function whose graph is given.
A. f(x) = -x2 - 9 B. f(x) = x2 - 9 C. f(x) = -x2 + 9 D. f(x) = x2 + 9
Mathematics