Simplify. Exponents must be positive and in lowest terms. 
A. 
B. 
C. 
D. 
E. none of these
Answer: B
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Suppose you have the following project digraph. (The numbers in parentheses represent hours.)
Using the critical-path algorithm to schedule this project with three processors, the project finishing time is
A. 13 hours. B. 12 hours. C. 11 hours. D. 14 hours. E. none of these
Use the fact that the trigonometric functions are periodic to find the exact value of the expression. Do not use a calculator.cot 540°
A. 0
B. -1
C. 
D. undefined
Write an equivalent expression. Use a commutative law.9 + b
A. b9 B. 9(1 + b) C. 9b D. b + 9
Solve the problem.Sybil is having her yard landscaped. She obtained an estimate from two landscaping companies. Company A gave an estimate of $180 for materials and equipment rental plus $60 per hour for labor. Company B gave an estimate of $230 for materials and equipment rental plus $50 per hour for labor. We can represent this situation with the system of linear equationsc = 180 + 60xCompany Ac = 230 + 50xCompany Bwhere c is the total cost and x is the number of hours of labor. Graph the system. What is the x-coordinate of the intersection point of the graphs? Describe what this x-coordinate means in practical terms.
A. 5; for 5 hours of labor, both companies charge the same. B. 8; for 8 hours of labor, both companies charge the same. C. 4; for 4 hours of labor, both companies charge the same. D. 4; there is a number of hours of labor, for which both companies charge $400.