If r(t) is the position vector of a particle in the plane at time t, find the indicated vector.Find the acceleration vector.r(t) = (6 ln(9t))i + (3t3)j
A. a = 
t-2i + 18tj
B. a = - 
i + 18tj
C. a = 
i + 9tj
D. a = - 
t-2i + 18tj
Answer: B
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Evaluate the expression.
-4
A. - 
B. - 
C. 
D. 
Solve the problem.The liquid portion of a diet is to provide at least 300 calories, 36 units of vitamin A, and 90 units of vitamin C daily. A cup of dietary drink X provides 60 calories, 12 units of vitamin A, and 10 units of vitamin C. A cup of dietary drink Y provides 60 calories, 6 units of vitamin A, and 30 units of vitamin C. Set up a system of linear inequalities that describes the minimum daily requirements for calories and vitamins. Let x = number of cups of dietary drink X, and y = number of cups of dietary drink Y. Write all the constraints as a system of linear inequalities.
A. 
B. 
C. 
D. 
Represent the shaded area in the figure group with an improper fraction.
A. 
B. 
C. 
D. 
Find the indicated roots.Sixth roots of 1; standard form
A. 1, 
+ 
i, - 
+ 
i, -1, - 
- 
i, 
- 
i
B. 1, 
+ 
i, - 
+ 
i, -1, - 
- 
i, 
- 
i
C. i, 
+ 
i, - 
+ 
i, -i, - 
- 
i, 
- 
i
D. i, 
+ 
i, 
- 
i, -i, - 
- 
i, - 
+ 
i