Find the exact or approximate circumference of the circle, as indicated.Find the approximate circumference. Use 
for ?.
A. 104,104 in.
B. 572 in.
C. 1144 in.
D. 286 in.
Answer: B
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Find the center of mass of a thin plate covering the given region with the given density function.The region between the x-axis and the curve y = 
, 1 ? x ? 2, with density ?(x) = 
A. 
= 
, 
= 1
B. 
= 
, 
= 3
C. 
= 
, 
= 1
D. 
= 
, 
= 2
Use the Laws of Exponents to simplify. Write the answer with positive exponents. All variables are nonzero.
A. 
B. 
C. 
D. 
Select the more reasonable temperature for the item.Room temperature20°C20°F
A. 20°F B. 20°C
Use a graphing utility to graph the function over the indicated interval and approximate any local maxima and local minima. If necessary, round answers to two decimal places.f(x) = x2 + 2x - 3; (-5, 5)
A. local maximum at (1, -4) B. local minimum at (1, 4) C. local minimum at (-1, -4) D. local maximum at (-1, 4)