Add or subtract by first simplifying each radical and then combining any like radicals. Assume that all variables represent positive numbers.
+ 
+ 
+ 
A. 10
+ 
+ 
B. 10
+ 21
C. 52
+ 21
D. 
+ 
+ 21
Answer: B
Mathematics
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Solve the given differential equation (where the function is subject to the given conditions) by using Laplace transforms.y" + 16y = 0, y
= 0, y' 
= 1
A. y = 
cos 4t
B. y = 
sin 4t
C. y = sin 4t
D. y = cos 4t
Mathematics
Calculate the work done by the force F along the path C.F = -9yi + 9xj + 2z8k; C: r(t) = cos ti + sin tj , 0 ? t ? 7
A. W = 63
B. W = 126
C. W = 0
D. W = 
Mathematics
Determine whether the Law of Sines or the Law of Cosines should be used to begin to solve the given triangle. Do not solve the triangle. 
A. Law of Sines B. Law of Cosines
Mathematics
Convert using dimensional analysis.5 yards to inches
A. 1
in.
B. 15 in.
C. 180 in.
D. 60 in.
Mathematics