Find the volume of the described solid.The base of a solid is the region between the curve y = 3cos x and the x-axis from x = 0 to x = ?/2. The cross sections perpendicular to the x-axis are isosceles right triangles with one leg on the base of the solid.
A. 
?
B. 2?
C. 
?
D. 
?
Answer: C
Mathematics
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Provide an appropriate response.If X has density function f(x) = 
find k.
A. 12
B. 2
C. 
D. 24
E. 
Mathematics
If possible, evaluate the expression by hand. If not, approximate the answer to the nearest hundredth.
A. 6 B. 14 C. 36 D. Not a real number
Mathematics
Solve the problem.The formula 
can be used to estimate the maximum safe velocity v, in miles per hour, at which a car can travel along a curved road with a radius of curvature r, in feet. To the nearest whole number, find the radius of curvature if the maximum safe velocity is 30 miles per hour.
A. 2250 ft B. 144 ft C. 360 ft D. 900 ft
Mathematics
Write a general term an for the sequence. Assume that n begins with 1.
, 
, 
, 
, . . .
A. an = 
B. an = 
C. an = 
D. an = 
Mathematics