Simplify the expression. Assume that all variables are positive when they appear.
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Find the area of the specified region.Shared by the circles r = 9 cos ? and r = 9 sin ?
A. 
(? - 2)
B. 
(4? - 3
)
C. 
?
D. 
(2 - 
)
Mathematics
Add. -23 + 23
A. 1 B. 46 C. -46 D. 0
Mathematics
Solve. Round your answer to the nearest tenth, if necessary.The formula P = 0.63x2 - 0.048x + 1 models the approximate population, P, in thousands, for a species of fish in a local pond, x years after 2010. During what year will the population reach 91.144 thousand fish?
A. 2022 B. 2024 C. 2021 D. 2023
Mathematics
Solve the problem.y varies directly as z2 and y = 216 when z = 6. Find y when z = 3.
A. 36 B. 108 C. 18 D. 54
Mathematics