Find the angle 
by using either the table or a calculator. Round your answer to four decimal places.
?
A. 
B. 
C. 
D. 
E. 
Answer: D
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Indicate whether the number is a proper fraction, an improper fraction, or a mixed number.
A. mixed number B. proper fraction C. improper fraction
Provide an appropriate response.Describe the elements of a 4 × 4 identity matrix.
A. The matrix has zeroes on the main diagonal. All other elements are ones. B. All elements of the matrix are ones. C. The matrix has ones on the main diagonal and zeroes below the main diagonal. D. The matrix has ones on the main diagonal, and all other elements are zero.
A card is drawn randomly from a standard 52-card deck. Find the probability of the specified event. The card is the 4 of spades.
A. 
B. 
C. 
D. 
Use slack variables to convert the constraints into linear equations.Maximizez = x1 + 2x2 + 3x3subject to:x1 + 4x2 + 3x3 ? 40 9x1 + x2 + 9x3 ? 50with:x1 ? 0, x2 ? 0, x3 ? 0
A. x1 + 4x2 + 3x3 + s1 = 40 9x1 + x2 + 9x3 + s2 = 50 B. x1 + 4x2 + 3x3 = s1 + 40 9x1 + x2 +9x3 = s2 + 50 C. x1 + 4x2 + 3x3 + s1 = 40 9x1 + x2 + 9x3 + s1 = 50 D. x1 + 4x2 + 3x3 = s1 - 40 9x1 + x2 +9x3 = s2 - 50