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.
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Round your answers to two decimal places if necessary.
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What will be an ideal response?
??
B: The number of species is decreased by 5.34%.
?
C: 
?
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The graph of ax2 + bx + c is given. Use this graph to solve ax2 + bx + c = 0, if possible.
A. 4 B. 0 C. -4 D. No real solutions
Multiply the conjugates. Assume all variables have nonnegative values.(2
- 8
)(2
+ 8
)
A. 860
B. 860 + 32
C. -804
D. -90
Which one of the following summary statistics is not a measure of the variation (spread) in a data set?
A. Median B. Standard deviation C. Range D. Interquartile range
Solve.Given that sin (3?/8) = 
and cos (3?/8) = 
, find tan (3?/16).
A. 
B. 
C. 
D. 