A parabolic arch spans a stream 220 feet wide. How high above the stream must the arch be to give a minimum clearance of 20 feet over a channel in the center that is 180 feet wide?
A. 20 feet
B. 31.325 feet
C. 60.5 feet
D. 80.5 feet
E. 34.725 feet
Answer: C
You might also like to view...
Use a spherical coordinate integral to find the volume of the given solid.the solid between the spheres 
and 
A. 
?
B. 
?
C. 
?
D. 
?
Solve the problem.Assume the curl of a vector field F is zero. Can one automatically conclude that the circulation 
for all closed paths C? Explain or justify your answer.
What will be an ideal response?
Use integration by parts to establish a reduction formula for the integral.
, n ? 1
A. 
= 
cotn-1 x - 
B. 
= 
cotn-1 x + 
C. 
= 
cotn-2 x - 
D. 
= - cotn-1 x + 
Use the formula for 
to solve.A club elects a president, vice-president, and secretary-treasurer. How many sets of officers are possible if there are 8 members and any member can be elected to each position? No person can hold more than one office.
A. 336 B. 1680 C. 168 D. 112