Use the graph of a quadratic function to find the solution set of the equation or inequality. For a solution set that involves an interval, use interval notation.-x2 + 8x - 16 > 0
A. (-?, 4) ? (4, ?)
B. x = 4
C. ?
D. (-?, ?)
Answer: C
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Express as a single logarithm and, if possible, simplify.ln cos ? - ln 
A. ln cos ?
B. ln 
C. ln 
D. ln 10
Solve.The sum of the squares of two numbers is 145 and the difference of their squares is 17. Find the two numbers
A. 8 and 9; 8 and -9; -8 and 9; -8 and -9 B. 8 and 9; 8 and -9 C. 8 and 9 D. 8 and 9; -8 and -9
The graph shows the monthly revenue in millions of dollars of a growing company after the company doubled its advertising. Use the graph to solve the problem. 
During what period of time is the company's monthly revenue decreasing?
A. From the time that the advertising was doubled until the 6th month B. From the 6th month to the 9th month C. From the time that the advertising was doubled until the 9th month D. From the 9th month to the 12th month
Simplify the rational expression. Find all numbers that must be excluded from the domain of the simplified rational expression.
A. 
, x ? - 
B. 
, x ? -8, -4
C. - 
, x ? -8, -4
D. 
, x ? - 