Use a double-angle identity to find the exact value of the expression.1 - 2 sin2 
A. 
B. - 
C. - 
D. 
Answer: A
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Evaluate the limit by direct evaluation. Change the form of the function where necessary. 
x2 - 4x - 6
A. Does not exist B. 18 C. -10 D. 2
Find the y-intercepts and any x-intercepts.f(x) = -3x2 - 2x + 2
A. y-intercept (0, 2), x-intercepts 
and 
B. y-intercept (0, 2), x-intercepts 
and 
C. y-intercept (0, 2), no x-intercepts
D. y-intercept (0, 2), x-intercepts 
and 
Graph the linear function.
A. 
B. 
C. 
D. 
Suppose the number of endangered species y can be approximated by the formula 
where t is the number of years past 1980. How many species does the formula estimate will be added to the endangered species list between 2007 and 2020? Round your answer to the nearest whole number.
?
?
A. 448 species. B. 443 species. C. 474 species. D. 469 species. E. 420 species.