The magnitudes , , and the angle ? between the vectors v and w are given. Round the requested magnitude or angle to the nearest tenth. = 13,  = 7, ? = 28°Find 

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A. -140.7
B. 19.5
C. 14.8
D. 7.6

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Answer: B

Mathematics

Find all the second order partial derivatives of the given function.f(x, y) = xy2 + yex2 + 5

A.  = ye^x2(1 + 2x²);  = x;   =  = y + xe^x2
B.  = 2ye^x2;  = 2x;   =  = 2y + 2xe^x2
C.  = 2ye^x2(1 + 2x²);  = 2x;   =  = 2y + 2xe^x2
D.  = 2ye^x2;  = 2x;   =  = 2xe^x2

Evaluate the integral.

A.  tan^-1  + C
B.  ln  + C
C.  ln  + C
D. 2  + 2 tan^-1  + C

Using the pair of parametric equations, find the values of A and B in the table.x = 2t + 5, y = t - 3, for 0 ? t ? 7

A. A = 7, B = -2 B. A = 8, B = 4 C. A = 2, B = -3 D. A = 13, B = 1

Express the sum or difference as a product of sines and/or cosines.cos  + cos 

A. 2 sin(4?) sin ?
B. 2 cos(4?)
C. 2 sin(4?) sin 
D. 2 cos(4?) cos