Use the commutative or the associative property to complete the statement. State which property is used.6 + (-4) = -4 + 
A. -6; associative property
B. -6; commutative property
C. 6; associative property
D. 6; commutative property
Answer: D
Mathematics
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The vector r(t) is the position vector of a particle at time t. Find the angle between the velocity and the acceleration vectors at time t = 0.r(t) = e2ti + (5 + e-2t)j + (3 cos 9t)k
A. 
B. 
C. 0
D. 
Mathematics
Sketch D and g(D) from the description of D and change of variables 
x = u cos v, y = u sin v where D is the rectangle 1 ? u ? 2, 0 ? v ? 
?
A.
 ? |  |
B.
 ? |  |
C.
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D.
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Mathematics
Add or subtract. Simplify your answer to lowest terms.
- 
A. 
B. 
C. 
D. 
Mathematics
Find the product.(5m2 - 3m + 2)(m2 - 5m - 5)
A. 5m4 - 25m3 - 8m2 + 5m - 10 B. 5m4 - 28m3 - 8m2 + 5m - 10 C. 5m4 - 28m3 - 10m2 + 5m - 10 D. 5m4 - 25m3 - 10m2 + 5m - 10
Mathematics