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) = ti + (
t + 
t2)k
A. 0
B. 
C. 
D. ?
Answer: B
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?Which of the following is not associated with the expected value? ?
A. ?Often the value with the highest probability of occurring. B. ?The mean value of the experiment. C. ?The median value of the experiment. D. ?The average value of the data. E. ?None of the above.
The following figure has volume as indicated. Find the value of x.V = 32?
(a right circular cone)
A. 16
B. 
C. 2
D. 4
Provide an appropriate response.The set of rational numbers is the set of all numbers which can be expressed in the form 
, where a and b are integers and 
is not equal to 0.
A. 
; b
B. a ? b; a
C. 
; a
D. a ? b; b
Factor completely, or state that the polynomial is prime.64x3y3 - x6y6
A. (4xy - x2y2)(16x2y2 + 4x3y3 + x4y4) B. prime C. x3y3(4 - xy)(16 + 4xy + x2y2) D. x3y3(4 + xy)(16 - 4xy + x2y2)