Solve the problem.The function V(r) = 4?r2 describes the volume of a right circular cylinder of height 4 feet and radius r feet. Find the instantaneous rate of change of the volume with respect to the radius when r = 9. Express the answer in terms of ?.
A. 72? cubic feet per feet
B. 18? cubic feet per feet
C. 36? cubic feet per feet
D. 8? cubic feet per feet
Answer: A
Mathematics
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Find v ? u.v = 5i - 3j and u = -8i - 7j
A. -3i - 10j B. -40i + 21j C. -61 D. -19
Mathematics
For the point given in rectangular coordinates, find equivalent polar coordinates 
for 
and 
(6
, 6)
A. (12, 30°) B. (24, 30°) C. (6, 45°) D. (12, 60°)
Mathematics
Solve.Two tracking stations are on the equator 130 miles apart. A weather balloon is located on a bearing of N 36°E from the western station and on a bearing of N 21°E from the eastern station. How far is the balloon from the western station?
A. 478 miles B. 421 miles C. 412 miles D. 469 miles
Mathematics
Find the slope of the line going through the given pair of points.
and 
A. 
B. 
C. 
D. 
Mathematics