Graph the complex number.-1 - 4i 
A. 
B. 
C. 
D. 
Answer: C
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Provide an appropriate response.Consider the linear equation in three variables x - y + z = 6. Find a pair of linear equations that, when considered together with the given equation, will form a system having no solution.
What will be an ideal response?
Solve the problem.The following graph shows that more and more people in a certain country are moving from urban areas to the suburbs. In 2000, the percentage of the population living in urban areas was 71 and this percentage decreased by 2.4 each year, on average, in the period 2000-2010. In 2000, the percentage of the population living in the suburbs was 4 and this percentage increased by 2.4 each year, on average, in the period 2000-2010. Assuming this trend continues, estimate the year in which the percentage of the population living in urban areas will be equal to the percentage living in the suburbs. 
A. 2015 B. 2014 C. 2019 D. 2011
Solve the problem. Round to the nearest cent.Mark wants to start an IRA that will have $250,000 in it when he retires in 25 years. How much should he invest quarterly in his IRA to do this if the interest is 7% compounded quarterly?
A. $7181.79 B. $1748.94 C. $1514.79 D. $937.20
Provide an appropriate response.Determine the interval(s) over which 
is concave upward.
A. (-3, ?) B. (-?, ?) C. (-?, -3) D. (-?, 3)