Find the unit vector that has the same direction as the vector v.v = -7j
A. u = -j
B. u = 49j
C. u = -7j
D. u = - 
j
Answer: A
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Solve the problem.An order of award presentations has been devised for seven people: Jeff, Karen, Lyle, Maria, Norm, Olivia, and Paul. In how many ways can the first award be presented to Karen and the last to Lyle?
A. 120 B. 24 C. 360 D. 840
Solve the problem.Suppose that the labor cost for a building is approximated by 
where x is the number of days of skilled labor and y is the number of days of semiskilled labor required. Find the minimum labor cost.
A. $28,260 B. $26,900 C. $20,420 D. $19,740
Verify that the values of the variables listed are solutions of the system of equations.
x = -4, y = -1
A. solution B. not a solution
Solve the equation over the interval [0, 2?).sin x cos x = 
A. 
B. 
C. 
D. {0}