Solve the equation.
x+1= 
x-1
A. 
B. 
C. 
D. 
Answer: D
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The number S of species of birds on an island is given approximately by
,
where A is the area, in square kilometers, of the island that is usable for birds.A: If a conservation program is able to increase the usable area by 25%, how is the number of species affected? Express your answer in terms of a percent.B: If a natural disaster reduces the usable area of the island by 23%, how is the number of species affected? Express your answer in terms of a percent.C: If the number of bird species is 54, and the usable area is 218 square kilometers, find the value of c.
?
Round your answers to two decimal places if necessary.
?
What will be an ideal response?
Sketch the indicated graph.Sketch the graph of the rectangular equation 
. Transform this equation to polar coordinates and then sketch the curve.
A. 
B. 
C. 
D. 
The graph of the boundary equations for the system of inequalities is shown with the system. Find the corners of the solution region.
A. (0, 0), (6, 0), (0, 12), (3, 3) B. (0, 0), (4, 0), (0, 6), (3, 3) C. (0, 0), (6, 0), (0, 6), (3, 3) D. (0, 0), (4, 0), (0, 12), (3, 3)
Evaluate.Let a = 8i + 4j. Find 2a.
A. 16i + 4j B. 10i + 4j C. 16i + 8j D. 10i + 6j