Solve the problem.An auto repair shop charged a customer $359 to repair a car. The bill listed $59 for parts and the remainder for labor. If the cost of labor is $30 per hour, how many hours of labor did it take to repair the car?
A. 9 hr
B. 10.5 hr
C. 11 hr
D. 10 hr
Answer: D
Mathematics
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Combine terms.y3 - 6y4 + 8y2 + y4 - 12y3
A. -6y4 + y3 + 8y2 B. 5y4 + 11y3 - 8y2 C. -5y4 - 11y3 + 8y2 D. -5y8 - 11y6 + 8y2
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Factor.4a2 - b2
A. (2a - b)(2a + b) B. (2 - b)(2 + b) C. (2b - a)(2b + a) D. (2a - b)2
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Find the exact value of the indicated trigonometric function of ?.cot ? = - 
, cos ? < 0Find csc ?.
A. 
B. - 
C. 
D. - 
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If possible, find the matrix product of AB.A = [-7 2 9]; B = 
A. AB = [561]
B. AB = [-63 0 -27]
C. AB = [-90]
D. AB = 
Mathematics