A balloon 30.2 m in radius is to be filled with helium. How many m 3 of helium are needed to fill it?
A. 64,700 m 3
B. 126,000 m 3
C. 107,000 m 3
D. 119,000 m 3
E. 115,000 m 3
Answer: E
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Solve the given differential equation.
+ 9
+ 20y = -15
A. y = c1e-5x + c2e-4x + 
B. y = c1e5x + c2e4x - 
C. y = c1e-5x + c2e-4x
D. y = c1e-5x + c2e-4x - 
Solve.Approximate to the nearest hundredth the volume of a sphere with a radius of 3 centimeters. Use 3.14 for ?.
A. 63.59 cu cm B. 904.32 cu cm C. 113.04 cu cm D. 37.68 cu cm
Find the indicated matrix.Let A = 
and B = 
. Find AB.
A. 
B. 
C. 
D. not defined
Solve the problem.Alan is building a garden shaped like a rectangle with a semicircle attached to one short side along its diameter. The diameter of the semicircle is equal to the width of the short side of the rectangle. If he has 80 feet of fencing to go around the garden, what dimensions will give him the maximum area in the garden?
A. width = 
? 22.4, length = 11.2
B. width = 
? 11.2, length = 22.4
C. width = 
? 22.4, length = 28.8
D. width = 
? 14.4, length = 21.5