Find an equation of the circle that satisfies the given conditions.
Radius 9 and center at the origin.
Mathematics
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Provide an appropriate response.The current population of a threatened animal species is 1 million, but it is declining with a half-life of 
How many animals will be left in 80 years?
A. 22,965 animals B. 46 animals C. 45,929 animals D. 230 animals
Mathematics
Find the exact value of the expression. Do not use a calculator.cos [cos-1 (-0.9372)]
A. -0.9372 B. -0.4686 C. 0.9372 D. 0.4686
Mathematics
Find an equation of the secant line containing (1, f(1)) and (2, f(2)).f(x) = 
A. y = (-
- 2)x - 
+ 4
B. y = (
- 2)x - 
+ 4
C. y = (-
+ 2)x + 
- 4
D. y = (
- 2)x + 
- 4
Mathematics
Find the eigenvalues and the corresponding eigenvectors 
What will be an ideal response?
Mathematics