Given matrix A, find the indicated minor or cofactor.Find the cofactor A13.A =
A. -21
B. 8
C. 23
D. 21
Answer: D
Mathematics
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Express the relationship between a small change in x and the corresponding change in y in the form 
.y = x
A. dy = 
dx
B. dy = 
dx
C. dy = 
dx
D. dy = 
dx
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Find the derivative of y with respect to x, t, or ?, as appropriate.y = 5xex - 5ex
A. 5ex B. 5xex C. 5x D. 5xex + 10ex
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For an arc length s, area of sector A, and a central angle ? of a circle of radius r, find the indicated quantity.? = 1.5 radians, s = 18 in., find r
A. 27 in. B. 12 in. C. 8.6 in. D. 4.3 in.
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Find A-1 without a calculator.A = 
A. A-1 = 
B. A-1 = 
C. A-1 = 
Mathematics