Solve the problem.A person coughs when a foreign object is in the windpipe. The velocity of the cough depends on the size of the object. Suppose a person has a windpipe with a 
radius. If a foreign object has a radius r, in mm, assume that the velocity V, in mm/second, needed to remove the object by a cough is given byV(r) = k(23r2 - r3), 0 ? r ? 23, where k is some positive constant. For what size object is the maximum velocity needed to remove the object? Round answer to the nearest tenth, if necessary.
A. 16.3
B. 11.5
C. 7.7
D. 15.3
Answer: D
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The following question refers to the graph below.
The ordered pair (a, b) is given by
A. (?, ?).
B. (1, ?).
C. (?, ? + 1).
D. (
, 
+ 1).
E. (
, ?).
Determine the types of symmetry that the quilt pattern below has (line, turn, point), if any.
A. This quilt square has no symmetry. B. This quilt square has 2 lines of symmetry, 180° turn symmetry, and point symmetry. C. This quilt square has 2 lines of symmetry, 90° and 270° turn symmetry. D. This quilt square has 4 lines of symmetry, 90°, 180°, and 270° turn symmetry, and point symmetry.
Insert <, >, or = to make the statement true.-4 
0
A. > B. = C. <
Find the volume.Of a rectangular solid 2.9 m × 2.7 m × 8 m
A. 67.28 m3 B. 172.8 m3 C. 21.141 m3 D. 62.64 m3